1 Introduction
2 Literature review
3 Study data
3.1 Traffic data
3.2 Weather data
4 Methodology
4.1 PTC site selection
4.2 Grouping of PTC sites
Road group | PTC No. | Class | Highway | Type | Closest weather station | |
---|---|---|---|---|---|---|
COM | 60021810 | Freeway | Hwy 2 | Multilane | C3031093 | C303C642 |
COM | 60023210 | Freeway | Hwy 2 | Multilane | C3012205 | C3012206 |
COM | 50011010 | Expressway | Hwy 1 | Multilane | C3031093 | C3031094 |
COM | 50161860 | Freeway | Hwy 16 | Multilane | C3012710 | C3014922 |
RCOM | 50011850 | Expressway | Hwy 11 | Multilane | C3030QLP | C3030862 |
RCOM | 60021060 | Expressway | Hwy 21 | Multilane | C3033240 | C3036099 |
RCOM | 50160650 | Arterial | Hwy 16 | Multilane | C3062246 | C3062242 |
RCOM | 60200260 | Major Arterial | Hwy 20 | Two lanes | C3022159 | C3025441 |
RLD | 50030610 | Arterial | Hwy 3 | Two lanes | C3034596 | C3032624 |
RLD | 60221610 | Major Arterial | Hwy 22 | Two lanes | C303AFGF | C3031678 |
RLD | 60221850 | Major Arterial | Hwy 22 | Two lanes | C3024920 | C3026KN2 |
RLD | 50270670 | Major Arterial | Hwy 27 | Two lanes | C3026KNQ | C3024920 |
REC | 50010050 | Freeway | Hwy 1 | Multilane | C3050519 | C3050526 |
REC | 50010250 | Freeway | Hwy 1 | Multilane | C3050778 | C3050533 |
REC | 50010610 | Freeway | Hwy 1 | Multilane | C303F0PP | C3031676 |
4.3 Data sampling
Counting durations | Days-of-week and time-of-day included | Number of samples per week | Total no. samples in a season from all sites | |
---|---|---|---|---|
12 h | Monday 7:00 a.m. to 7:00 p.m. | 4 | Summer | 540 |
Tuesday 7:00 a.m. to 7:00 p.m. | ||||
Wednesday 7:00 a.m. to 7:00 p.m. | Winter | 660 | ||
Thursday 7:00 a.m. to 7:00 p.m. | ||||
24 h | Monday 12:00 p.m. to Tuesday 12:00 p.m. | 3 | Summer | 405 |
Tuesday 12:00 p.m. to Wednesday 12:00 p.m. | ||||
Wednesday 12:00 p.m. to Thursday 12:00 p.m. | Winter | 495 | ||
48 h | Monday 12:00 p.m. to Wednesday 12:00 p.m. | 2 | Summer | 270 |
Tuesday 12:00 p.m. to Thursday 12:00 p.m. | Winter | 330 | ||
72 h | Monday 12:00 p.m. to Thursday 12:00 p.m. | 1 | Summer | 135 |
Winter | 165 | |||
96 h | Monday 12:00 a.m. to Friday 12:00 p.m. | 1 | Summer | 135 |
Winter | 165 | |||
1 week | Monday 12:00 a.m. to Sunday 12:00 p.m. | 1 | Summer | 135 |
Winter | 165 |
4.4 Data analysis
5 Analysis and results
5.1 Consistency of SDCs taken during summer and winter months
Road group | Counter | Season | Ranges of CV (%) | |||||
---|---|---|---|---|---|---|---|---|
12 h | 24 h | 48 h | 72 h | 96 h | 1 week | |||
COM | 60021810 | S | 2.4–4.8 | 1.7–4.1 | 1.1–3.9 | 0.8–3.8 | 0.7–3.7 | 1.1–4.3 |
W | 4.2–9.8 | 3–7.6 | 2.4–7 | 1.6–7.1 | 1.7–7 | 1.6–8.6 | ||
COM | 60023210 | S | 2.3–3.3 | 2–3.8 | 2–3.3 | 1.2–3.3 | 1.1–3.3 | 0.6–3.5 |
W | 3.9–8.2 | 4–7.8 | 3–7.8 | 2.5–7.4 | 2.7–6.8 | 2.5–7.5 | ||
COM | 50111450 | S | 3.7–6.2 | 3.6–6.8 | 3.1–6.9 | 3–6.7 | 2.3–6.8 | 1.3–5.6 |
W | 5.7–12.8 | 6.1–13 | 5.8–13 | 5.9–13.1 | 6.3–13.2 | 5.9–12.6 | ||
COM | 50161860 | S | 1.9–4.2 | 1.9–4 | 1.7–3.7 | 1.7–3.7 | 1.8–4.1 | 1.1–3 |
W | 2.6–8.4 | 2.8–6.9 | 2.4–6.3 | 2–6.2 | 1.7–6.2 | 2.1–6.5 | ||
RCOM | 50011850 | S | 3.8–6.7 | 2.5–6.4 | 1.8–6.1 | 1.6–5.9 | 1.9–4.9 | 2.3–4.2 |
W | 5.6–11.9 | 4.2–10.9 | 2.5–10.8 | 1.5 -11 | 1.9–10.5 | 1.3–9.9 | ||
RCOM | 60021060 | S | 3.5–5.0 | 2.5–4.5 | 1.6–4 | 1.1–3.8 | 1.2–3.4 | 1.8–3.2 |
W | 5.6–10.3 | 4.1–11.1 | 2.8–9.3 | 2–8.7 | 1.9–8.6 | 1.7–7.7 | ||
RCOM | 50160650 | S | 4.1–6 | 3.6–5.2 | 3.3–4.8 | 3.2–4.7 | 2.9–4.8 | 3.2–5 |
W | 6.6–10.7 | 6.1–9.6 | 5.6–9.3 | 4.9–9.3 | 5–9.3 | 3.6–8.4 | ||
RCOM | 60200260 | S | 2.9–8.6 | 3–7 | 2.9–6.9 | 1.6–6.6 | 1.9–6.1 | 1.7–10.4 |
W | 4.6–15.0 | 4.9–15.3 | 3.6–15.5 | 3.4–14.6 | 3.4–14.1 | 2.3–12.6 | ||
RLD | 50030610 | S | 3.4–9.6 | 2.3–6.3 | 1.8–4.2 | 1.5–4.1 | 0.9–5.5 | 1.4–4.1 |
W | 6.6–11.8 | 5.6–11.4 | 4.5–11.6 | 3.9–11.4 | 4–10.3 | 2–9 | ||
RLD | 60221610 | S | 4.5–6.4 | 3.8–5.7 | 2.7–5.6 | 2.2–5.1 | 2.4–4.9 | 2.5–4.2 |
W | 5.7–12.2 | 5.5–10.8 | 4.3–9.9 | 3.9–9.1 | 3.8–9.7 | 5.3–10.3 | ||
RLD | 60221850 | S | 4.8–8.1 | 3.4–6 | 2.8–5.4 | 2.6–5.1 | 2.6–5.8 | 2–4.8 |
W | 7.2–12.6 | 6.5–12.5 | 5.5–12.3 | 6–12.7 | 5.4–13.2 | 6.5–12.3 | ||
RLD | 50270670 | S | 3.3–7.1 | 2.7–6.5 | 2.0–6.4 | 1.8–6.5 | 1.6–6.4 | 1.7–4.4 |
W | 4.9–12.8 | 4.4–11.4 | 3.8–10 | 3.8–10.2 | 3.8–10.1 | 2.7–8.4 | ||
REC | 50010050 | S | 4.0 -6.0 | 3–4.6 | 2.1–4.1 | 1.9–4 | 1.7–4.2 | 1.4–4.4 |
W | 5.2–13.4 | 4–12 | 2.9–12-3 | 3.1–11.9 | 3.1–10.8 | 3–11.7 | ||
REC | 50010250 | S | 4.8–7.6 | 2.9–5.9 | 1.7–5.2 | 1.4–5.2 | 1.3–4.8 | 1.6–4.9 |
W | 7.6–16.1 | 5.4–14.4 | 3.7–13.8 | 2.5–14.5 | 3.2–12.8 | 2.1–14.8 | ||
REC | 50010610 | S | 5.1–7.1 | 3.4–5.4 | 1.8–4.6 | 1.5–4.3 | 1.1–4.1 | 1.5–3.7 |
W | 7.9–15.2 | 6.4–13.2 | 5.7–12.4 | 5.2–12.5 | 6.1–11 | 7.1–11.6 |
5.2 Effects of counting interval
5.3 Effects of road type
5.4 Effects of season
5.5 Effect of rainfall on summer SDCs
5.6 Effect of snowfall and temperature on winter SDCs
Study site | Reduction (%) | Average reduction (%) | Study site | Reduction (%) | Average reduction (%) |
---|---|---|---|---|---|
COM50011010 | 27.52 | 19.64 | RCOM50011850 | 27.56 | 26.58 |
COM50161860 | 17.11 | RCOM50160650 | 25.28 | ||
COM60021810 | 27.78 | RCOM60021060 | 27.61 | ||
COM60023210 | 15.33 | RCOM60200260 | 25.88 | ||
RLD50030610 | 32.55 | 30.44 | REC | 43.61 | 47.03 |
RLD50270670 | 24.83 | REC | 46.74 | ||
RLD60221610 | 30.50 | REC | 50.74 | ||
RLD60221850 | 33.89 |