Incident-related factors and explanations
| Categories | Variables | Values |
|---|---|---|
| Temporal factors | Time of the daya | 0:00–23:59 |
| Day of the week | Monday to Sunday | |
| Season | Spring, summer, autumn and winter | |
| Spatial factors | Location of the incident | -- |
| Type of road | Tunnels, elevated roads and general roads | |
| Distance from CBD | (Continuous variable) | |
| Environmental factors | Weather | Sunny, rainy, foggy and snowy |
| Visibililty | 0–10 km | |
| Traffic condition | Congested or not | |
| Pavement condition | Dry or wet | |
| Incident details | Incident type | -- |
| Occupied lanesb | 1, 2, 3 or more and road closed | |
| The number of involved cars | 1, 2, 3 or more | |
| Injuries and deaths | None, 1, 2, 3 or more | |
| Incident number on the same road in one day | None, 1, 2, 3 or more | |
| Secondary incidents | Yes, no | |
| Involvement of a bike | Yes, no | |
| Work zone involved | Yes, no | |
| Incident on HOV lane | Yes, no | |
| Incident severityc | A1, A2 and A3 | |
| Shoulder availability | Yes, no | |
| Operational factors | Police requirement | Yes, no |
| Towing cars | Yes, no | |
| Medical response | Yes, no | |
| Patrol involved | Yes, no | |
| Traffic control | -- | |
| Moving to shoulder | Yes, no |
| Categories | Variables | Values |
|---|---|---|
| Temporal factors | Time of the daya | 0:00–23:59 |
| Day of the week | Monday to Sunday | |
| Season | Spring, summer, autumn and winter | |
| Spatial factors | Location of the incident | -- |
| Type of road | Tunnels, elevated roads and general roads | |
| Distance from CBD | (Continuous variable) | |
| Environmental factors | Weather | Sunny, rainy, foggy and snowy |
| Visibililty | 0–10 km | |
| Traffic condition | Congested or not | |
| Pavement condition | Dry or wet | |
| Incident details | Incident type | -- |
| Occupied lanesb | 1, 2, 3 or more and road closed | |
| The number of involved cars | 1, 2, 3 or more | |
| Injuries and deaths | None, 1, 2, 3 or more | |
| Incident number on the same road in one day | None, 1, 2, 3 or more | |
| Secondary incidents | Yes, no | |
| Involvement of a bike | Yes, no | |
| Work zone involved | Yes, no | |
| Incident on HOV lane | Yes, no | |
| Incident severityc | A1, A2 and A3 | |
| Shoulder availability | Yes, no | |
| Operational factors | Police requirement | Yes, no |
| Towing cars | Yes, no | |
| Medical response | Yes, no | |
| Patrol involved | Yes, no | |
| Traffic control | -- | |
| Moving to shoulder | Yes, no |
Notes:
aSimilar expression: peak hour or not, daytime or night; bSimilar expression: capacity reduction; cA1: People died during an accident, A2: People injured during an accident or died after an accident and A3: Property damage; HOV = high occupancy vehicle
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