Research Article
An Analysis of the Effects of Crash Factors and Precrash Actions on Side Impact Crashes at Unsignalized Intersections
Table 3
Descriptive statistics of variables used in model estimation.
| Variable | Four-way intersection | T-junction | Frequency | Percent (%) | Frequency | Percent (%) |
| Crash location | | | | | Rural | 3756 | 27.0 | 2593 | 24.1 | Urban | 10,154 | 73.0 | 8157 | 75.9 |
| Crash location | | | | | Other crash locations | 409 | 2.9 | 437 | 4.1 | Open country | 4004 | 28.8 | 2765 | 25.7 | Residential area | 4378 | 31.5 | 3055 | 28.4 | Shopping center | 5119 | 36.8 | 4493 | 41.8 |
| Roadway condition | | | | | Other roadway conditions | 70 | 0.5 | 57 | 0.5 | Dry roadway condition | 12,046 | 86.6 | 9127 | 84.9 | Wet roadway condition | 1794 | 12.9 | 1566 | 14.6 |
| Lighting condition | | | | | Other lighting conditions | 536 | 3.9 | 443 | 4.1 | Daylight | 11,292 | 81.2 | 8694 | 80.9 | Dark without lighting | 1359 | 9.8 | 1046 | 9.7 | Dark with lighting | 723 | 5.2 | 567 | 5.3 |
| Roadway curvature and grade | | | | | Straight level road | 11,898 | 85.5 | 8352 | 77.7 | Straight road with grade | 1781 | 12.8 | 1891 | 17.6 | Curved roadway | 231 | 1.7 | 507 | 4.7 |
| Turn lane | | | | | No turn lane | 11,062 | 79.5 | 7497 | 69.7 | Turn lane present | 2848 | 20.5 | 3253 | 30.3 |
| Traffic control device | | | | | Functional | 10,935 | 78.6 | 7067 | 65.7 | Not functional | 2975 | 21.4 | 3683 | 34.3 |
| Contributing factor | | | | | Speeding | 264 | 1.9 | 248 | 2.3 | DUI | 214 | 1.5 | 193 | 1.8 |
| At-fault driver gender | | | | | Female | 7163 | 51.5 | 5327 | 49.6 | Male | 6747 | 48.5 | 5423 | 50.4 |
| At-fault driver age | | | | | Other age groups | 1551 | 11.2 | 1128 | 10.5 | Less than 22 | 3004 | 21.6 | 2584 | 24.0 | Between 22 and 31 | 2917 | 21.0 | 2215 | 20.6 | Between 32 and 41 | 1868 | 13.4 | 1374 | 12.8 | Between 42 and 51 | 1515 | 10.9 | 1205 | 11.2 | Between 52 and 61 | 1593 | 11.5 | 1205 | 11.2 | Between 62 and 71 | 1462 | 10.5 | 1039 | 9.7 |
| Point of initial contact of the causal vehicle | | | | | Others | 2576 | 18.5 | 2103 | 19.6 | Front passenger side | 1174 | 8.4 | 1035 | 9.6 | Back passenger side | 1035 | 7.4 | 798 | 7.4 | Bumper | 6496 | 46.7 | 4926 | 45.8 | Driver door | 1395 | 10.0 | 936 | 8.7 | Passenger side behind the driver | 1234 | 8.9 | 952 | 8.9 |
| Causal vehicle type | | | | | Other vehicles | 921 | 6.6 | 774 | 7.2 | Passenger car | 7358 | 52.9 | 5812 | 54.1 | Pickup | 2498 | 18.0 | 1853 | 17.2 | SUV | 3133 | 22.5 | 2311 | 21.5 |
| Second vehicle type | | | | | Other vehicles | 1256 | 9.0 | 1091 | 10.1 | Passenger car | 7036 | 50.6 | 5481 | 51.0 | Pickup | 2658 | 19.1 | 1997 | 18.6 | SUV | 2960 | 21.3 | 2181 | 20.3 |
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