Introduction
Methodology
Literature review strategy
Literature selection: inclusion and exclusion criteria
Literature extraction
Overall impacts of the pandemic on mobility regardless of Government’s measures
Relationship between human mobility and COVID-19 transmission
Ref | Study area | Method | Data used | Mode | Key findings |
---|---|---|---|---|---|
Badr et al. (2020) | USA (25 counties) | Generalized linear model | O/D trip matrices (cell phone data), COVID-19 data | Overall mobility | Mobility patterns are strongly correlated with decreased COVID-19 case growth rates (correlation coefficients above 0.7 for 20 of the 25 counties). |
Carteni et al. (2021) | Italy | Regression | COVID-19 reports, rail service characteristics, survey | Overall mobility | Transport accessibility is the variable that better explained the number of Covid-19 infections (about 40% in weight). |
Chen et al. (2020) | China (Wuhan & Hubei) | Bayesian space-time model | COVID-19 cases, population migration data | Overall mobility | The case numbers of different provinces and cities of Hubei province were highly correlated with the emigrated populations from Wuhan. |
Cintia et al. (2020) | Italy | Regression | Daily mobility flows (mobile phone data), COVID-19 related data | Overall mobility | A strong relationship between the mobility flows and the net reproduction number during the lockdown. |
Habib et al. (2021) | 10 countries | Non-linear modeling | COVID-19 & mobility data | Overall mobility | A significant positive association between COVID-19 and transportation mobility in the USA, UK, Spain, Italy, Canada, France, Germany & Belgium. |
Iacus et al. (2020b) | France, Italy, & Spain | Regression | O/D trip (mobile phone), number of deaths by COVID-19, distance | Overall mobility | Mobility alone can explain up to 92% of the initial spread in France and Italy. |
Kartal et al. (2021) | Turkey | Toda-Yamamoto causality test | COVID-19 & mobility data | Overall mobility | There is cointegration between the variables in the long term, and is an econometric causality between mobility indicators and pandemic indicators. |
Kissler et al. (2020) | USA (New York) | Bayesian distribution analysis | Trip data (Facebook data), COVID-19 test results | Overall mobility | COVID-19 infection was lowest in boroughs with the greatest reductions in morning movements out of and evening movements into the borough. |
Lau et al. (2020) | China & international | Regression | Air passenger volume; flight routes; COVID-19 cases | Air | A strong correlation between COVID-19 cases and passenger volume. |
Lee et al. (2020a) | Korea | Regression | Daily national traffic data, COVID-19 cases | Overall mobility | All regions except Incheon showed negative linear relationships between numbers of newly confirmed cases and traffic. |
Liu et al. (2020b) | China (350 cities) | Regression model, simulation | COVID-19 confirmed cases, mobility data | Overall mobility | All mobility patterns correlated with the spread of the virus, while the correlations dropped with the implementation of travel restrictions. |
Oztig & Askin (2020) | 144 countries | Negative binomial regression | Airline passengers & airports, population density, elderly people | Air | A positive relationship between volume of airline passenger traffic and numbers of COVID-19 patients. |
Pang et al., (2023) | China (Wuhan & others) | Gravity model | HSR train operations, COVID-19 cases, population | HSR | One more HSR train originating from Wuhan each day before the Wuhan lockdown increases the cumulative number of Covid-19 cases in a city by about 10% |
Shi & Fang (2020) | China (31 provinces) | ARIMA model | COVID-19 cases, traffic volume (cellphone location), distance, GDP | Overall mobility | The volume of outbound traffic from Wuhan was positively associated with COVID-19 incidence in all provinces, with correlation coefficients between 0.22–0.78 (all P < 0.05). |
Sokadjo & Atchade (2020) | World | Various regression | COVID-19 case & passenger air traffic data | Air | When passenger air traffic increases by one unit, the number of cases increases by one new infection. |
Sy et al. (2020) | USA (New York) | ANOVA, regression | COVID-19 case, subway ridership, demographic & socioeconomic data | Subway | Increased mobility & most of sociodemographic variables were associated with a higher rate of COVID-19 cases per 100k. |
Yuksel et al. (2020) | Canada | Regression | Mobility (Apple, Google, Facebook), weather, COVID-19 data | Overall mobility | The degree of social distancing under strict restrictions is bound by choice. |
Zhang et al. (2020b) | China (Wuhan and other cities) | Gravity model | COVID-19 cases, transport service, GDP, distance & location of cities, airport/HSR station | HSR, coach & air | Frequencies of air flights and HST services out of Wuhan are significantly associated with the number of COVID-19 cases in the destination cities. |
Zhao et al. (2020a) | China (10 city clusters) | Regression | Passengers (cellphone location), COVID-19 cases data | Overall mobility | A strong and significant association between travel by train and the number of COVID-19 cases. |
Zhao et al. (2020b) | China (Wuhan & 6 cities) | Regression | Passengers by car, train & flight; COVID-19 confirmed cases data | Car, train & air | A statistically significant positive association between the load of passengers multiplied by the local infectivity in Wuhan and the number of cases reported outside Wuhan. |
Zheng et al. (2020) | China | Pearson correlation analysis | Frequencies of public transport, distance, COVID-19 cases | Flight, bus & train | A positive association between the frequency of flights, trains, & buses from Wuhan and the daily as well as the cumulative numbers of COVID-19 cases in other cities. |
Impact of COVID-19 on overall mobility
Ref | Study area | Method | Data used | Mode | Key findings |
---|---|---|---|---|---|
Abu-Rayash & Dincer (2020) | Selected cities in the world | Mathematical model | Transportation related, Mobility Index data | Overall mobility | As of the end of June 2020, cities with higher than 50% mobility index include Brussels, Singapore, Stockholm, Lyon, Paris, Moscow, and Hong Kong with the highest mobility index of 76%. |
Arimura et al. (2020) | Japan (Sapporo) | Comparative analysis | Mobile spatial statistics | Overall mobility | The city’s residents have been more likely to stay home and less likely to travel to the center area, resulting in a decrease of up to 90% of the population density in crowded areas. |
Bucsky (2020) | Hungary (Budapest) | Comparative analysis | Daily transport volume & ridership data | All types | Public transport experienced the greatest reduction in demand (80%), while cycling (23%) and bike sharing (2%) saw the lowest decrease. |
Chen (2020) | Canada | Regression | Google reports, COVID-19 cases & deaths data, temperature | Overall mobility | Visits to nonresidential locations sharply dropped, with a corresponding increase in visits to residential locations. |
Cui et al. (2020) | USA (Seattle) | Comparative analysis | Loop detector data, public agency data, COVID-19 datasets | Overall mobility | Developed Traffic Performance Score (TPS) that incorporates multiple parameters for measuring network-wide traffic performance. |
Gao et al. (2020a) | USA (New York) | Comparative analysis | Ridership, weigh-in-motion, NYC open data | Overall mobility | Ridership data show steep declines in both transit ridership and vehicular traffic after the stay-at-home order |
Gao et al. (2020d) | USA (NY, Seattle) | Comparative analysis | Ridership, weigh-in-motion, NYC open data | All types | Low volume in transit ridership and motor vehicle trips: Subway ridership remained down 91% and vehicular traffic via MTA bridges and tunnels was down 68% in April 2020 vs. 2019 in NY. |
Gonzalez et al. (2021) | Spain | Comparative analysis | Smart card, bluetooth traffic monitoring data | Car, public transit | Public and private mobility dramatically decreased to 95% and 86% of their pre-COVID-19 values. |
Hasselwander et al. (2021) | Philippines | Analytical analysis | Cell phone & GPS data | All types | Travelers most reliant on public transport were disproportionately affected by lockdowns. |
Jia et al. (2020) | China (Wuhan & other cities) | Various models | Mobile phone data, COVID-19 case, population & GDP | Overall mobility | The distribution of population outflow from Wuhan accurately predicts the relative frequency and geographical distribution of infections with COVID-19. |
Kaufman et al. (2020) | USA (New York) | Comparative analysis | Public data | All types | On April 12th, 2020, subway ridership had dropped 96%. Commuter rail suffered the greatest losses at up to 97.9% less than 2019 levels; followed by subways at 91.7%. and buses at 78.3%. |
Lee et al. (2020b) | USA | Comparative analysis | Mobile device location, COVID-19 case, population data | Overall mobility | Public movements were decreased after the national emergency declaration. The population staying home has increased in all states. |
Lee et al. (2023) | Korea | Comparative analysis | Smart card, private vehicle records | Car, public transit | A significant decrease in trip frequency was found during non-peak hours on weekdays and during weekends. People reduced their daily trip distances: private vehicle usage increased for shorter trip distances while bus usage dropped regardless of the ranges of trip distances under the pandemic |
Nian et al. (2020) | China (Chongqing) | Spatial lag model | Taxi trip, POI data | Taxi | The number of taxi trips dropped sharply, and the travel speed, travel time, and spatial distribution of taxi trips had been significantly influenced during the epidemic. |
Parr et al. (2020) | USA (Florida) | Comparative & statistical analysis | Traffic count data | Highway traffic | Compared to similar days in 2019, overall statewide traffic volume dropped by 47.5%. There were also differences between rural and urban areas. |
Ruiz-Euler et al. (2020) | USA (6 urban centers) | Comparative analysis | Mobile device location, census data | Overall mobility | A different drop rate of mobility for high & low income groups, which we call the mobility gap. |
Wang et al. (2020) | USA (New York) | Agent-based simulation | Vehicle traffic, subway ridership, Apple report data | Car, subway, walk, bike | A full reopening would only see as much as 73% of pre-COVID transit ridership and an increase in the number of car trips by as much as 142% of pre-pandemic levels, assuming mode preferences held during the crisis are maintained. |
Wen et al. (2021) | New Zealand | Comparative analysis | Google & Apple reports | Overall mobility | Lockdown had a significant impact on the reduction in mobility and variation in transport mode. |
Impact of COVID-19 on public transportation
Ref | Study area | Method | Data used | Mode | Key findings |
---|---|---|---|---|---|
Ahangari et al. (2020) | USA (10 medium-sized cities) | Comparative analysis, regression | Ridership & operation, sociodemographic data | Public transit | The ridership decreases from March, the start of the pandemic, while experienced the most decrease in ridership in April. The only factor affecting rail ridership reduction was the unemployment rate. |
Almlof et al. (2021) | Sweden (Stockholm) | Binomial logit model | Smart card data | Public transit | Decreases in public transport use are linked to areas with a population of high socioeconomic status (e.g. income levels, owned houses and high employment levels). |
Borsati et al. (2022) | Italy | Regression | COVID-19 mortality, transit usage | Public transit | Places with larger commuting flows exhibit higher excess mortality during the first wave of the pandemic, but no significant spatial association between excess mortality and transit usage. |
Gkiotsalitis & Cats (2022) | USA (Washington DC) | Mixed-integer quadratic model | Metro operational data, O/D demand data | Public transit | It provides optimal redistribution of vehicles across lines for different social distancing scenarios. |
Jenelius & Cebecauer (2020) | Sweden (3 cities) | Comparative analysis | Ticket validations, sales & passenger counts data | Public transit | The decrease in public transport ridership (40–60% across regions) was severe compared with other transport modes. |
Jiang & Cai (2022) | China (Beijing, Shanghai) | Generalized linear models | Ridership, COVID-19, socioeconomic, weather | Metro | One additional cumulative local COVID-19 case within 14 days results in a reduction in metro ridership by 0.091% in Beijing & 0.112% in Shanghai. |
Konecny et al. (2021) | Slovak | Analytical analysis | Population mobility, Demand & supply data | Public transit | The number of total passenger transport systems for suburban bus transport (SBT) decreased by 70% in April, 2020. There was a more significant decrease in the number of passengers in the first wave of the pandemic than during the second wave. |
Liu et al. (2020c) | USA (113 public transit systems) | Logistic function model, regression & correlation | Transit mobile phone app, socioeconomic & demographic, COVID-19 case data | Public transit | Communities with higher proportions of essential workers, vulnerable populations (African American, Hispanic, Female, and people over 45 years old), and more coronavirus Google searches tend to maintain higher levels of minimal demand during the pandemic. |
Orro et al. (2020) | Spain (Coruna) | Comparative analysis | Automatic vehicle location, bus stop boarding, smart card operation data | Car, bus, bicycle | The impact on transit ridership during the lockdown process was more significant than that on general traffic. These impacts are not uniform across the bus network. |
Pozo et al. (2022) | Spain | Mathematical analysis | Ticket validation | Public transit | Ridership has dramatically decreased by 95% at the pandemic peak, recovering very slowly and reaching only half its pre-pandemic levels at the end of September, 2020. |
Suman et al. (2020) | India (Delhi) | Optimization model | Bus demand & supply related data | Bus | The Business-as-Usual (BAU) scenario involving the current allocation approach will make it impossible to use public buses even if the bare minimum physical distancing has to be maintained. |
Wilbur et al. (2020) | USA (Nashville, Chattanooga) | Comparative analysis | Ridership, census data | Public transit | Fixed-line bus ridership dropped by 66.9% and 65.1% from 2019 baselines before stabilizing at 48.4% and 42.8% declines respectively. |
Yang & Chen (2022) | China | Regression | Daily operational frequency | Railway, aviation | HSR and aviation operations were both severely impacted by the outbreak of COVID-19. HSR generally has a strong substitution effect on the aviation system. |
Other impacts: bicycles, shared mobility, environment and traffic safety
Changes in personal travel behavior based on surveys
Ref | Study area | Method | Data used | Mode | Key findings |
---|---|---|---|---|---|
Abdullah et al. (2020) | Various countries | Descriptive & quantitative analyses | Survey | All types | Gender, car ownership, employment status, travel distance, purpose of traveling, & pandemic-related factors were found to be significant predictors of mode choice during the pandemic. |
Abdullah et al. (2021) | Pakistan | Binary logistic model | Survey | Car, public transit | Gender, income, education, profession, trip frequency, car ownership, motorbike ownership, & safety precautions were found to be significant predictors of the public transit choice. |
Astroza et al. (2020) | Chile | Joint models of probit & regression | Survey | All types | A decrease of 44% of trips in Santiago, with metro (55%), ride-hailing (51%), & bus (45%) present the highest reduction. |
Atchison et al. (2021) | UK | Regression | Survey | All types | Ability to adopt & comply with certain non-pharmaceutical interventions is lower in the most economically disadvantaged in society. |
Beck and Hensher (2020a) | Australia | Comparative analysis | Survey | Overall mobility | Aggregate travel has increased by 50% since initial restrictions, but is still less than two-thirds of that which occurred prior to COVID-19. |
Beck & Hensher (2021b) | Australia | Descriptive analysis | Survey | Overall mobility | Reported trips have reduced significantly from an average of 23.9 trips per week down to 11.0, a reduction of over 50% in weekly household trips. |
Bhaduri et al. (2020) | India | Multiple discrete choice model | Survey | All types | Found significant inertia to continue using the pre-COVID modes, & high propensity to shift to virtual (e.g. WFH) & private modes from shared ones (e.g. bus). |
Borkowski et al. (2021) | Poland | General linear model | Survey | All types | Significant drops in travel times under epidemic conditions was observed, regardless of the age group & gender |
Bounie et al. (2020) | France | Statistical analysis | Consumer transaction data | Overall mobility | The mandatory containment has significantly affected consumers’ mobility: visited fewer cities, & spent more in the home city. |
Campisi et al. (2020) | Italy (Sicily) | Correlation & regression | Survey | All types | Women were less likely to walk than men. Participants were more likely to resume remote work even after the second phase. |
Chan et al. (2020) | 58 countries | Statistical analysis | Survey, Google reports, socio-demographic, COVID-19 cases | Overall mobility | Risk-taking attitudes are a critical factor in predicting reductions in human mobility & social confinement. |
Costa et al. (2022) | Brazil | Multinomial & mixed logit models | Survey | All types | Comfort & frequency of the urban transit service were important factors to attract users during the pandemic. |
Das et al. (2021) | India | Logistic regression | Survey | Car, public transit | Age, gender & monthly income tend to influence mode switch preferences. Travel time, overcrowding & hygiene are associated with mode shift preferences from public transport to car. |
de Haas et al. (2020) | Netherlands | Comparative analysis | Survey | All types | Number of trips & distance travelled reduced by 55% and 68% respectively. About 80% of people reduced their activities outdoors, with a stronger decrease for older people. |
Dingil & Esztergár-Kiss (2021) | International | Multinomial model | Survey | Overall mobility | Public transport users are 31.5, 10.6, and 6.9 times more likely to change their commuting transport mode than car users, motorcycle users, & walkers, respectively. |
Downey et al. (2022) | Scotland | Bivariate probit model | Survey | Public transport | Over a third expect to use buses (36%) and trains (34%) less, whilst a quarter expect to drive their cars more. |
Fatmi (2020) | Canada (Kelowna) | Comparative analysis | Daily activities survey | Overall mobility | Individuals’ participation in out-of-home activities were reduced by more than 50%. The majority of long-distance travel was made regionally using private car. |
Harrington & Hadjiconstantinuou (2022) | UK | Statistical analysis | Survey | All types | Of the car commuters, 81.9% may continue travelling by car once restrictions are lifted, while of the public transport commuters, 49.0% might switch modes. |
Hotle et al. (2020) | USA | Generalized ordered logit regression | Survey | All types | A recent personal experience with influenza-like symptoms & being female significantly increased risk perception at mandatory & medical trip locations. |
Javadinasr et al. (2022) | USA | Ordered probit model | Survey | All types | 48% of the respondents anticipate having the option to WFH after the pandemic, which indicates an approximately 30% increase compared to the pre-pandemic period. In the post-pandemic period, auto and transit commuters are expected to be 9% and 31% less than pre-pandemic, respectively |
Jiao & Azimian (2021) | USA | Binary logit model | Survey | All types | Age, gender, educational status, marital status, work loss, difficulty with expenses, household size, work type, income, health status, & anxiousness were associated with changes in travel behavior. |
Jou et al. (2022) | Taiwan | Logistic regression, ordered logit models | Survey | All types | The total travels by private vehicles are significantly reduced, but no significant decrease in the use of transit, possibly because transit users have no choice. |
Kamplimath et al. (2021) | India | Statistical analysis | Survey | All types | Comfort & hygiene are now the most important factor that affects the mode choice of travel followed by the cost and travel time. |
Marra et al. (2022) | Switzerland | Comparative analysis, Mixed logit model | Travel survey (GPS tracking) | Public transit | The travel distance for every mode of public transit in 2020 is around 50% less than 2019. |
Mashrur et al. (2022) | Canada | Logit choice models | SP survey | Public transit | Transit frequency dropped by 21–71% for various socioeconomic groups. Vaccine availability & mandatory face-covering onboard positively affect choices of riding transit. |
Meena (2020) | India | Descriptive analysis | Survey | All types | After the end of lockdown, people will reduce their non-mandatory trips & higher income group will try to avoid travelling in public transport, taxi & other mass transport. |
Meister et al. (2022) | Switzerland | Mixed discrete-continuous model | GPS tracking travel diary data | All types | Public transit saw the largest decrease in traveled distance & trip frequencies, with an almost 100% reduction during lockdown. |
Mogaji (2020) | Nigeria (Lagos) | Statistical analysis | Survey | Overall mobility | The study recognizes the effect on transportation in emerging economies, where lockdowns and restrictions on movement may be ineffective. |
Moslem et al. (2020) | Italy (Palermo, Catania) | Best-worst method | Survey | All types | Bus remained the third choice of Italians, but the multimodality increased, which may influence the mobility choices even if the epidemic ends. |
Parady et al. (2020) | Japan | Regression | Survey | All types | Risk perception was associated with higher probabilities of going-out self-restriction for eating-out and leisure. |
Pawar et al. (2020) | India | Decision tree analysis | Survey | All types | About 41% of commuters stopped traveling, 51.3% were using the same mode of transport & 5.3% of commuters shifted from public to private mode. Safety perceptions did not play a significant role in mode choice behavior. |
Przybylowski et al. (2021) | Poland (Gdansk) | Descriptive analysis | Survey | All types | About 90% of respondents resigned or limited their usage of public transport. Almost 75% of respondents plan to return to using public transport when the epidemic situation has stabilized. |
Schaefer et al. (2021) | German (Hanover) | Regression | Survey | All types | Local light rail & bus are substituted by bike, car & WFH, while train use is not significantly replaced by car & seems to be positively related to bike use. |
Shakibaei et al. (2020) | Turkey (Istanbul) | Descriptive analysis | Panel data | All types | 5.6% of the commuters who were using public transit during phase 1 of the study started to use private car during phase 2. Shift to the private car was even more remarkable in the transition to phase 3. |
Shelat et al. (2022) | Netherlands | Latent class choice model | SP survey | Railway | Older and female travellers are more likely to be COVD conscious while those reporting to use the trains more frequently tend to be infection indifferent. |
Simovi´c et al. (2021) | 7 South-East European countries | Regression | Survey | Public transit | The acceptability of vehicle occupancy differs with respect to age, education, & health conditions of the respondents. |
Sogbe (2021) | Ghana | Statistical analysis | Survey | Public transit | Commuters considered physical distancing, occupants wearing face masks, cleanliness of vehicle & safety as essential factors for transit mode choice. |
Tan & Ma (2021) | China | Logistic regression | Survey | Rail | Occupation, commuting modes before COVID-19, walking time to the nearest subway station, the possibility of being infected in private car in public transport have significant influence on the commuters’ choice of rail transit. |
Yang et al. (2021) | China | Qualitative analysis | Survey | All types | Students, lower income cohorts, groups living in small communities, & those working in tourism, catering, informal businesses & transport-related sectors were more vulnerable than others. |
Zubair et al. (2022) | Thailand | Regression | Survey | All types | People’s priorities shifted from travel time saving, safety & security, comfort, & cleanliness to infection concerns, social distance, cleanliness, & passengers’ face masks for mode selection. |
Effects of measures on mobility reduction and COVID-19 spread
Ref | Study area | Type of measure※ | Method | Data used | Mode | Key findings |
---|---|---|---|---|---|---|
Aloi et al. (2020) | Spain (Santander) | A | Comparative analysis | Traffic count, public transport data | Car, public transit | Public transport users dropped by up to 93%, NO2 emissions were reduced by up to 60%, & traffic accidents were reduced by up to 67% in relative terms. |
Anzai et al. (2020) | China, Japan | C | Statistical model | COVID-19 cases, travel volume | Overall mobility | As the delay is small, the decision to control travel volume through restrictions on freedom of movement should be balanced between the resulting estimated epidemiological impact and predicted economic fallout. |
Arellana et al. (2020) | Colombia (7 cities) | A, F | Comparative analysis | Traffic volume & operation data, Google reports | Air, freight, urban transport | National policies & local decisions have decreased motorized trips, diminishing congestion levels, reducing transit ridership, & creating a reduction in transport externalities. |
Askitas et al. (2020) | 135 countries | C, D | Multiple events model | COVID-19 prevalence data, Google reports | Overall mobility | Cancelling public events & enforcing restrictions on gatherings have the largest effect on curbing the pandemic. Workplace & school closures as well as stay-at-home requirements also reduce activities away from home, but not as large as for public events and gatherings. |
Awad-Núñez et al. (2021) | Spain | C | Choice modeling | Survey | Public transport, shared mobility | Some measures, such as the increase of supply & vehicle disinfection, result in a greater willingness to use public transport in post-COVID-19 times. |
Buhat et al. (2020) | Philippines (Manila) | F, G | Agent-based model simulation | N/A | Train, bus | Social distancing reduces the risk of being infected; minimizing movement or interaction with other passengers reduces the risk of transmission by 50%; passenger capacity should be less than 10–50% of the maximum seating capacity to reduce the number of infections. |
Chen et al. (2022a) | Netherlands | Various (Four-level) | Error component latent class choice model | Survey | Public transport | The older & highly educated people are more susceptible to enforcement measures, whereas young & single citizens are more accessible to noncompulsory measures. |
Chen & Pan (2020) | China | B | Comparative analysis | National & global epidemic data | Overall mobility | Social distancing is important for controlling the spread of the epidemic. |
Chinazzi et al. (2020) | China | C | Epidemic & mobility model | COVID-19 case, airline flow, ground mobility flow | Overall mobility | The travel quarantine of Wuhan delayed the overall epidemic progression by only 3 to 5 days in mainland China but had a more marked effect on the international scale, where case importations were reduced by nearly 80% until mid-February. |
Dahlberg et al. (2020) | Sweden (Stockholm) | F | Difference-in-difference | Mobile phone data | Overall mobility | The daytime population in residential areas increased significantly (64%). The distance individuals move from their homes during a day was substantially reduced (38%). |
Dasgupta et al. (2020) | USA | F | Regression | Mobile device location, health & socioeconomic related data | Overall mobility | Counties without stay-at-home orders showed a mobility decline of -52.3%, slightly less than the decline in mandated areas (-60.8%). |
Espinoza et al. (2020) | N/A | C | Disease transmission model & simulation | COVID-19 infection risk & community-specific characteristics | Overall mobility | Mobility restrictions may not be an effective policy for controlling the spread of an infectious disease if it is assessed by the overall final epidemic size. |
Fang et al. (2020a) | China | C | SEIR model | COVID-19 case data | Overall mobility | More rigorous government control policies were associated with a slower increase in the infected population. Isolation & protective procedures would be less effective as more cases accrue. |
Fang et al. (2020b) | China | A* | Difference-in-differences | Population migration, COVID-19 infection data | Overall mobility | The lockdown of Wuhan reduced inflows to Wuhan by 76.98%, outflows from Wuhan by 56.31%, and within-Wuhan movements by 55.91%. |
Galeazzi et al. (2021) | France, Italy, UK | A | Analytical calculation | Facebook data, mobility network | Overall mobility | The reduction of the overall efficiency in the network of movements is accompanied by geographical fragmentation with a massive reduction of long-range connections. |
Gao et al. (2020b) | USA | F | Statistical analysis | Smartphone location data | Overall mobility | The platform provides daily mobilities in terms of median travel distance, percent change in mobility, & home dwell time. |
Gao et al. (2020c) | USA | F | Regression | Mobile phone location, COVID-19 case | Overall mobility | The correlation between the COVID19 growth rate and travel distance decay rate & dwell time at home change rate was − 0.586 & 0.526, respectively. |
Ghader et al. (2020) | USA | F | Comparative analysis | Mobile location, COVID-19 case, census population | Overall mobility | Statistics related to social distancing, namely trip rate, miles traveled per person, and percentage of population staying at home have all showed an unexpected trend, which we named “social distancing inertia.” |
Gramsch et al. (2022) | Chile | A | Regression | Smartcard data | Public transport | A decrease of 72.3% when schools suspended in-person classes, while the dynamic lockdowns reduced public transport demand by 12.1%. The effect of lockdowns decreased after the fifth week of their application. |
Hadjidemetriou et al. (2020) | UK | A, C | Logistic & regression models | Apple reports, COVID-19 related death | Car, transit, walking | Human mobility was observed to gradually decrease as the government was announcing more measures and it stabilized at a scale of around 80% after a lockdown was imposed. |
Heiler et al. (2020) | Austria | A | Comparative analysis | Mobile phone, COVID-19 infection data | Overall mobility | A reduction of commuters at Viennese metro stations of over 80% & the number of devices with a radius of gyration of less than 500 m almost doubled. |
Jaekel & Muley (2022) | Germany, Qatar | C | Comparative analysis | Google reports, traffic volume & crashes data | Overall mobility | The reduction in traffic volumes, major & minor crashes was coupled with restrictive measures rather than COVID-19 incidences for both countries. |
Klein et al. (2020a) | USA | D | Comparative analysis | Mobile device location | Overall mobility | By March 23, 2020 the policies have generally reduced by half the overall mobility in several major U.S. cities. |
Klein et al. (2020b) | USA | D | Data analysis | Mobile device location, commute data | Overall mobility | The average person had reduced their daily mobility by between 45–55% as of late April, 2020 and had reduced their daily contacts between 65–75%. |
Kraemer et al. (2020) | China | C | Generalized linear model | Real-time mobility, COVID-19 case & demographics | Overall mobility | Early on, the spatial distribution of COVID-19 cases in China was explained well by human mobility data. But, after the implementation of control measures, this correlation dropped and growth rates became negative in most locations. |
Linka et al. (2020) | Europe | C | SEIR model | Passenger air travel statistics, COVID-19 case data | Air | Mobility networks of air travel can predict the emerging global diffusion pattern of a pandemic at the early stages of the outbreak. |
Martin-Calvo et al. (2020) | USA (Boston) | F | SEIR model | Mobility data, census, COVID-19 data | Overall mobility | School closures & passive social distance strategies are not enough to contain the epidemic. A full confinement is not feasible & will not solve the problem, without active measures in place after the confinement, since there would be a new outbreak. |
Morita et al. (2020) | Japan (4 cities) | F | Correlation analysis | Google & Apple reports | Car, transit, walking | The behavioral inhibition manifests differently de-pending upon urban structure and climatic factors. |
Muller et al. (2020) | Germany (Berlin) | A | Dynamics model & simulation | Activity chains & trajectory | Overall mobility | Complete lockdown works. Complete removal of infections at primary schools, workplaces & during leisure activities will not be enough to sufficiently slow down the infection dynamics. Infections in public transport play an important role. |
Oum & Wang (2020) | N/A | A, C | Economic model | N/A | Overall mobility | Individuals do not internalize the external cost of infection risks they impose on others when making their own decisions, implying that the socially optimal length of lockdown is always longer than the privately optimal length of the lockdown period. |
Pan et al. (2020) | USA | D, F | Comparative & correlation | Mobile device location | Overall mobility | Both government orders & local outbreak severity significantly contribute to the strength of social distancing. |
Park (2020) | Korea (Seoul) | F | Statistical analysis | Subway ridership, COVID-19 cases | Subway | Compared to the third week of January 2020, the mean daily number of passengers in all stations decreased by 40.6% by the first week of March. |
Pepe et al. (2020) | Italy | A | Analytical analysis | Mobile phone location, Google reports | Overall mobility | Daily time-series of three different aggregated mobility metrics can help to monitor the impact of the lockdown on the epidemic trajectory & inform future public health decision making. |
Pullano et al. (2020) | France | A | Correlation analysis | Mobile trajectory, hospitalization, socioeconomic data | Overall mobility | Lockdown caused a 65% reduction in countrywide number of displacements. Individual response to policy announcements may generate unexpected anomalous behaviors increasing the risk of geographical diffusion. |
Santamaria et al. (2020) | Europe (15 countries) | A | Analytical calculation | Mobile positioning | Overall mobility | A large proportion of the change in mobility patterns can be explained by confinement measures. |
Schlosser et al. (2020) | Germany | A | Analytical SIR model | Mobile phone data | Overall mobility | Long-distance travel was reduced disproportionately strongly. The structural changes have a considerable effect on epidemic spreading processes. |
Vannoni et al. (2020) | 41 cities worldwide | C | Multivariate models | Mobility index, Oxford COVID-19 response dataset | Overall mobility | After adjusting for time-trends, the study observed that implementing non-pharmaceutical countermeasures was associated with a decline of mobility of 10.0% for school closures, 15.0% for workplace closures, 7.09% for cancelling public events, 18.0% for closing public transport. |
Wei et al. (2021) | China | A, C | Epidemic & mobility model | Population mobility, COVID-19 case, city network | Overall mobility | The containment effect of the lockdown of cities in Hubei was greater than that of decreasing intercity population mobility, & the effect of city lockdowns was more sensitive to timing relative to decreasing population mobility. |
Wellenius et al. (2021) | USA | F | Regression | Google reports | Overall mobility | State-of-emergency declarations resulted in a 10% reduction in time spent away from places of residence. Implementation of one or more social distancing policies resulted in an additional 25% reduction in mobility. |
Wielechowski et al. (2020) | Poland | A, C | Statistical analysis | Google reports, COVID-19 Response Tracker | Public transit | There is negative but insignificant relationship between human mobility changes in public transport & the number of new confirmed COVID-19 cases. |
Xu et al. (2020) | USA | F | Comparative & correlation | Twitter | N/A | A large reduction in travel after the implementation of social distancing policies, with larger reductions in states that were early adopters and smaller changes in states without policies. |
Yabe et al. (2020) | Japan (Tokyo) | C | Comparative analysis | Mobile phone, socioeconomic data, COVID-19 case | Overall mobility | Human mobility behavior decreased by around 50%, resulting in a 70% reduction of social contacts, showing the strong relationships with non-compulsory measures. |
Yilmazkuday (2020) | USA | E | Difference-in-difference | Travel data (smartphone), COVID-19 cases & deaths | Overall mobility | Staying in the same county has the potential of reducing total weekly COVID-19 cases and deaths as much as by 139,503 and by 23,445, respectively. |
Zhang et al. (2020a) | China | A* | SIR model | Population flow, daily infection data | Overall mobility | The study supports the existence of non-lock-down-typed measures that can reach the same containment consequence as the lock-down. |
Zhang et al. (2021a) | USA | F | Data integration & analysis | Mobile location, COVID-19 case, census population | Overall mobility | The interactive analytical tool identifies trips & produces a set of variables including social distancing index, percentage of people staying at home, visits to work and non-work locations, out-of-town trips, & trip distance. |
Zuo et al. (2020) | USA (NY, Seattle) | F | Data mining | COVID-19 case, transportation related data | Overall mobility | The mobility board presents multi-data views in terms of vehicular traffic volume, corridor travel time, transit ridership, freight traffic, as well as risk indicators in terms of reported crashes, pedestrian and cyclist fatalities & speeding tickets. |
Travel restriction policies’ impacts on reducing human mobility
The relationship between travel restriction policy and COVID-19 transmission
Controversial issues related travel restriction policy effects
Discussion on future research perspectives
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investigating changes in long-term and short-term travel behavior according to stages of the spread of COVID-19 and government measures;
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extensive investigation of controversial issues (i.e., effects of travel restriction policies on virus infection);
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in particular, regarding the estimation of infection risk levels in public transport, new evidence, and a thorough comparative analysis of previous research methodologies;
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analysis of how the analysis methodology of existing studies can affect the results;
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examining social distancing regulations’ implications for public transit (i.e., capacity or occupancy levels, a solution for expanding passenger demand);
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analyzing different public transit funding mechanisms, such as optimal transit fare structures;
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modeling a wide range of scenarios for shared mobility, paratransit modes, ride-sharing, ride-hailing, and carpooling;
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assessing alternative transportation services in rural and low-income areas; evaluating social equity issues related to transport availability;
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analyzing urban environment effects (i.e., land use and density) associated with travel patterns;
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exploring geographic heterogeneity, such as comparing urban and rural areas and international experiences;
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examining travel information’s effect on mitigating public transportation crowding; and.
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developing more sophisticated interactive simulation platforms that use real time data and provide simulation outputs with adequate indicators under various scenarios.
Conclusions
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Although many studies investigated the effectiveness of government measures to limit mobility, controversy remains regarding whether a single restriction measure can effectively reduce COVID-19 cases.
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City lockdowns and strict travel restrictions carry severe social-economic costs and may not be a feasible solution in some countries. No strong evidence emerged supporting a consistent connection between population flow and cross-regional infection except in a very early stage of the outbreak.
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Government measures regarding social distancing in response to COVID-19 seemed to be effective, but there was not strong evidence supporting a strict limit on human movement itself.
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Research in several countries showed that social distancing effectively reduced COVID-19 spread. There is general agreement that COVID-19 spreads through social activities in specific places (i.e., workplaces) and social gatherings after travel.
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Preparing for a “new normal” after the pandemic is recommended. The pandemic’s long-term consequences may lead to a new era involving economic and social changes, such as smart working and other daily activity patterns, that may reduce future mobility needs.