|
| Variable | No injury | Minor injury | Severe injury |
| 2017 | 2018 | 2019 | 2017 | 2018 | 2019 | 2017 | 2018 | 2019 |
|
| Driver characteristics |
| Improper action (1 if improper action, 0 otherwise) | −(0.0076) | | | −(−0.0078) | | | −(0.0002) | | |
|
| Vehicle characteristics |
| Single-vehicle indicator (1 if the number of vehicles involved in the crash is 1, 0 otherwise) | −(0.0104) | −(0.0112) | −(0.0208) | −(0.0015) | −(0.0010) | −(−0.0064) | −(−0.0119) | −(−0.0122) | (−0.0144) |
| Two-vehicle indicator (1 if the number of vehicles involved in the crash is 2, 0 otherwise) | −(0.0227) | | | −(−0.0245) | | | −(0.0018) | | |
| Multivehicle indicator (1: the total number of vehicles in the crash is more than 2, otherwise 0) | −0.0191 (−0.0097) | −0.0236 (−0.0134) | | −0.0007 (0.0071) | 0.0185 (0.0126) | | 0.0198 (0.0026) | 0.0050 (0.0008) | |
| Minibus (1 if the van involved in the crash, otherwise 0) | | | −(−0.0037) | | | −(0.0038) | | | −(−0.0001) |
| Bus (1 if the bus involved in crash, otherwise 0) | | −(−0.0035) | | | −(0.0025) | | | −(0.0010) | |
| Van (1 if the minibus involved in crash, otherwise 0) | | −(−0.0018) | | | −(−0.0002) | | | −(0.0020) | |
| Truck (1: the truck involved in crash, otherwise 0) | −(−0.0045) | −0.0234 (−) | | −(−0.0010) | 0.0256 (−) | | −(0.0055) | −0.0022 (−) | |
| Heavy truck (1: the heavy truck involved in crash, otherwise 0) | | −(−0.0121) | | | −(0.0131) | | | −(−0.0010) | |
|
| Road characteristics |
| : radius of the horizontal curve (103 m) | | −0.0480 (−) | | | −0.0053 (−) | | | 0.0533 (−) | |
| : length of the horizontal curve (103 m) | | −(−0.0462) | −(−0.0166) | | −(0.0484) | −(0.0215) | | −(−0.0022) | −(−0.0049) |
| : length of the longitudinal slope corresponding to the minimum grade (m) | | | −(0.0053) | | | −(0.0004) | | | −(−0.0057) |
| : length of the longitudinal slope corresponding to the maximum grade (m) | −(0.0200) | −(0.0642) | | −(−0.0206) | −(−0.0673) | | −(0.0006) | −(0.0031) | |
|
| Environmental characteristics |
| Sunny (1: the weather is sunny, otherwise 0) | −(−0.0039) | | | −(−0.0006) | | | −(0.0045) | | |
| Cloudy (1: the weather is cloudy, otherwise 0) | | −(−0.0223) | | | −(0.0232) | | | −(−0.0009) | |
| Rainy (1: the weather is rainy, otherwise 0) | | | −(−0.0040) | | | −(−0.0002) | | | −(0.0042) |
| Snowy (1: the weather is snowy, otherwise 0) | | −(−0.0055) | | | −(0.0058) | | | −(−0.0003) | |
| Icy road (1: the road is icy, otherwise 0) | | | −0.0098 (−) | | | −0.0001 (−) | | | 0.0099 (−) |
|
| Time characteristics |
| Monday (1: occurs on Monday, otherwise 0) | | −(−0.0084) | | | −(−0.0012) | | | −(0.0096) | |
| Tuesday (1: occurs on Tuesday, otherwise 0) | | −0.0298 (−) | −0.0147 (−) | | 0.0136 (−) | −0.0002 (−) | | 0.0162 (−) | 0.0149 (−) |
| Wednesday (1: occurs on Wednesday, otherwise 0) | −(−0.0081) | −(−0.0072) | −(−0.0066) | −(−0.0010) | −(−0.0009) | −(−0.0003) | −(0.0091) | −(0.0081) | −(0.0069) |
| Early morning (1: occurs from 0 : 00 to 5 : 59, otherwise 0) | −(−0.0246) | −0.0719 (−0.0125) | | −(−0.0035) | −0.0100 (−0.0018) | | −(0.0281) | 0.0819 (0.0143) | |
| Afternoon (1: occurs from 12 : 00 to 17 : 59, otherwise 0) | −(0.0056) | −(0.0098) | | −(−0.0057) | −(−0.0100) | | −(0.0001) | −(0.0002) | |
| Night (1: occurs from 18 : 00–23 : 59, otherwise 0) | −0.0211 (−0.0090) | −0.0354 (0.0060) | | −0.0023 (−0.0010) | −0.0047 (−0.0062) | | 0.0235 (0.0100) | 0.0402 (0.0002) | |
| Spring (1: occurs in spring, otherwise, 0) | −(0.0074) | | −(−0.0083) | −(−0.0061) | | −(−0.0004) | −(−0.0013) | | −(0.0087) |
| Summer (1: occurs in summer, otherwise 0) | | | −(−0.0046) | | | −(0.0044) | | | −(0.0002) |
| Winter (1: occurs in winter, otherwise 0) | −0.0703 (−0.0121) | −(−0.0051) | −0.0056 (−) | 0.0474 (0.0085) | −(−0.0006) | 0.0041 (−) | 0.0229 (0.0036) | −(0.0057) | 0.0015 (−) |
|
| Traffic characteristics |
| AADT (annual mean daily traffic volume, pcu/d) | 0.1504 (0.0961) | 0.1657 (0.0713) | 0.0983 (0.0599) | −0.1425 (−0.0848) | −0.1493 (−0.0082) | −0.0974 (−0.0589) | −0.0079 (−0.0113) | −0.0165 (−0.0631) | −0.0009 (−0.0010) |
|
| Crash characteristics |
| Sideswipe (1: the crash type is sideswipe, otherwise 0) | −(−0.0012) | | −(−0.0076) | −(−0.0001) | | −(0.0066) | −(0.0013) | | −(0.0010) |
| Hit fixed object (1: the crash type is hitting fixed object, otherwise 0) | −(0.0027) | | | −(0.0004) | | | −(−0.0031) | | |
| Rear-end collision (1: the crash type is rear-end collision, otherwise 0) | | | −(−0.0055) | | | −(0.0056) | | | −(−0.0001) |
| Other crash types (1: other crash types, otherwise 0) | −(0.0196) | −0.0705 (−) | | −(−0.0206) | 0.0790 (−) | | −(0.0010) | −0.0085 (−) | |
| EMS greater than 60 minutes (1: rescue response time greater than 60 minutes, otherwise 0) | | −(−0.0154) | | | −(−0.0020) | | | −(0.0174) | |
|
