Introduction
Model development
Measuring task complexity
Measuring time pressure
The activity based travel simulator
Travel time (min) | Travel cost (€) | |
---|---|---|
Within neighbourhood
| ||
Cycling | 6–10 | 0 |
Car | 3–5 | 1–2 |
Between neighbourhood and train station A
| ||
Cycling | 12–16 | 0 |
Car | 6–10 | 2–3 |
Between train station A and integrated facility
| ||
Walking | 1–3 | 0 |
Cycling | 1–3 | 0 |
Between train station A and train station B
| ||
Train | 35–45 | 4–6 |
Between train station B and office
| ||
Walking | 3–5 | 0 |
Between neighbourhood and office
| ||
Car | 46–56 | 7–10 |
Variations in task complexity and time pressure
Nr. of activities in an activity program | Nr. of travel alternatives in choice set | ||
---|---|---|---|
2 | 3 | 4 | |
1 |
CTnr 1: work | ||
2 |
CTnr 2: work, grocery shopping |
CTnr 3: work, fitness | |
3 |
CTnr 4: work, fitness, grocery shopping |
CTnr 5: work, meeting friends, fitness | |
4 |
CTnr 6: work, leisure shopping, fitness, meeting friends |
Choice task Nr. | 1 | 2 | 3 | 4 | 5 | 6 |
Value of time factor | 0.7 | 0.7 | 0.7 | 1.1 | 0.9 | 1.1 |
The sample
Characteristics | Category | Distribution (n = 113) (%) |
---|---|---|
Job | Paid job | 97.3 |
Volunteer | 0.8 | |
Others | 1.8 | |
Commuting to work (days per week) | ≥4 days | 74.3 |
4> and ≥2 days | 16.8 | |
<2 days | 8.9 | |
Age | 20–30 | 14.2 |
30–40 | 11.5 | |
40–50 | 25.7 | |
50–60 | 39.8 | |
60–70 | 8.8 | |
Gender | Male | 69.9 |
Female | 30.1 | |
Education | Lower education | 5.3 |
MAVO/VMBO | 27.4 | |
HAVO | 14.2 | |
VWO | 2.7 | |
WO/HBO | 50.4 | |
Marriage | Single | 31.9 |
Married | 48.7 | |
Partner/living together | 19.4 |
Participants’ experiences with ATS
Variable | Frequency | Percentage |
---|---|---|
It was easy to understand the travel simulator
| ||
1 very much disagree | 1 | 0.9 |
2 disagree | 1 | 0.9 |
3 neutral | 10 | 8.8 |
4 agree | 48 | 42.5 |
5 very much agree | 53 | 46.9 |
Average (4.34) | ||
It was easy to remain focused during the experiment
| ||
1 very much disagree | 1 | 0.9 |
2 disagree | 2 | 1.8 |
3 neutral | 2 | 1.8 |
4 agree | 60 | 53.1 |
5 very much agree | 48 | 42.4 |
Average (4.36) | ||
The information shown in the abstract map was illustrative
| ||
1 very much disagree | 1 | 0.9 |
2 disagree | 2 | 1.8 |
3 neutral | 1 | 0.9 |
4 agree | 67 | 59.3 |
5 very much agree | 42 | 37.1 |
Average (4.30) | ||
The daily activity programs presented in the experiment look realistic for my situation
| ||
1 very much disagree | 5 | 4.4 |
2 disagree | 12 | 10.6 |
3 neutral | 28 | 24.8 |
4 agree | 50 | 44.2 |
5 very much agree | 17 | 15.0 |
Average (3.52) | ||
It was enjoyable to participate in the experiment
| ||
1 very much disagree | 1 | 0.9 |
2 disagree | 1 | 0.9 |
3 neutral | 1 | 0.9 |
4 agree | 41 | 36.3 |
5 very much agree | 69 | 61.0 |
Average (4.56) |
Model estimation
The systematic component of the utility function
Specification of the scale
Estimating the model
Results
The impacts of task complexity and time pressure
MNL | HL | ML | HML | |||||
---|---|---|---|---|---|---|---|---|
Adjusted rho-square | 0.150 | 0.171 | 0.271 | 0.282 | ||||
Initial log-likelihood | −1528.12 | −1528.12 | −1528.12 | −1528.12 | ||||
Final log-likelihood | −1295.780 | −1260.534 | −1108.436 | −1088.864 | ||||
Likelihood ratio test | 464.68 | 535.172 | 839.368 | 878.512 | ||||
Nr. of draws | 3000 | 3000 | ||||||
Nr. of parameters | 3 | 6 | 5 | 8 |
Parameters | Value | t-stat. | Value | t-stat. | Value | t-stat. | Value | t-stat. |
---|---|---|---|---|---|---|---|---|
Mean (β
TC
) | −0.0415 | −2.74 | −0.0738 | −2.66 | −0.115 | −4.75 | −0.159 | −3.88 |
Spread (β
TC
)a
| (0.115) | (0.159) | ||||||
Mean (β
TT
) | −0.0125 | −2.16 | −0.00669 | −0.63 | −0.0476 | −5.10 | −0.0636 | −3.67 |
Spread (β
TT
) | (0.476) | (0.0636) | ||||||
Mean (β
TI
) | −0.373 | −14.41 | −0.690 | −3.86 | −0.590 | −9.72 | −0.938 | −5.20 |
Spread (β
TI
) | 0.406 | 4.21 | 0.590 | 2.63 | ||||
Mean(β
Car
)b
| 0 | 0 | 0 | 0 | ||||
SD (β
Car
) | 1.70 | 6.07 | 2.92 | 4.12 | ||||
λ
DT
| −0.0101 | −6.05 | −0.00745 | −3.16 | ||||
δ
T
| 2.03 | 3.95 | 2.56 | 4.44 | ||||
θ
T
| −3.36 | −4.58 | −3.96 | −5.01 |
Alternative | Travel cost (euro) | Travel time (min) | Nr. of travel interchanges | Car as dominant travel mode |
---|---|---|---|---|
1 | 10 | 118 | 7 | No |
2 | 15 | 117 | 9 | No |
3 | 12 | 110 | 8 | No |
4 | 19 | 121 | 5 | Yes |
Mixed logit (homoscedastic) | Heteroscedastic mixed logit | ||||
---|---|---|---|---|---|
Low task complexity | High task complexity | ||||
Low time pressure | High time pressure | Low time pressure | High time pressure | ||
P (alt1) | 0.23 | 0.22 | 0.25 | 0.25 | 0.25 |
P (alt2) | 0.06 | 0.05 | 0.19 | 0.14 | 0.23 |
P (alt3) | 0.30 | 0.27 | 0.26 | 0.27 | 0.26 |
P (alt4) | 0.41 | 0.47 | 0.30 | 0.35 | 0.27 |
P (alt4)–P(alt2) | 0.35 | 0.42 | 0.11 | 0.21 | 0.04 |