An Analysis of the Effects of Crash Factors and Precrash Actions on Side Impact Crashes at Unsignalized Intersections
Table 9
Behavioral pathway analysis of T-junctions with direct and indirect marginal effects.
Variable (X)
Direct ME on Y2
for Y1 RSS (%)
for Y1 FYSS (%)
for Y1 FYT (%)
ME on Y1 RSS
ME on Y1 FYSS
ME on Y1 FYT
for Y2 (%)
ME of Y1 RSS on Y2 (%)
ME of Y1 FYSS on Y2 (%)
ME of Y1 FYT on Y2 (%)
Indirect ME on Y2 through RSS (%)
Indirect ME on Y2 through FYSS
Indirect ME on Y2 through FYT (%)
Total ME on Y2
Urban
Yes
−9.14%
54.03
4.06%
25.52
19.07
4.09
5.37
0.00
3.41%
0.00
−5.73%
Crash location (base: other crash locations)
Open country
4.44%
14.42
1.46%
25.52
19.07
4.09
5.37
0.00
0.00%
1.22
5.66%
Residential area
25.52
19.07
4.09
5.37
0.00
0.00%
0.00
0.00%
Shopping center
49.20
14.42
3.00%
3.32%
25.52
19.07
4.09
5.37
0.00
2.90%
1.80
4.70%
Roadway condition
Dry
5.26
16.60%
25.52
19.07
4.09
5.37
0.00
0.00%
5.41
5.41%
Wet
5.26
2.36%
25.52
19.07
4.09
5.37
0.00
0.00%
1.01
1.01%
Lighting condition
Daylight
−3.97%
25.52
19.07
4.09
5.37
0.00
0.00%
0.00
−3.97%
Dark without lighting
25.52
19.07
4.09
5.37
0.00
0.00%
0.00
0.00%
Dark with lighting
25.52
19.07
4.09
5.37
0.00
0.00%
0.00
0.00%
Roadway geometry (base: curved roadway)
Straight level road
4.00
53.16
3.66%
11.82%
25.52
19.07
4.09
5.37
2.39
5.67%
0.00
8.07%
Straight road with grade
4.00
53.16
1.11%
2.56%
25.52
19.07
4.09
5.37
1.26
2.93%
0.00
4.19%
Turn lane present
Yes
3.68%
5.14
55.48
−0.01%
−1.90%
25.52
19.07
4.09
5.37
0.97
1.71%
0.00
6.36%
No functioning traffic control
Yes
5.32
67.44
−1.04%
−11.45%
25.52
19.07
4.09
5.37
0.55
-0.63%
0.00
−0.08%
At-fault driver_speeding
Yes
20.94%
53.09
18.23
−0.31%
3.02%
25.52
19.07
4.09
5.37
0.00
2.08%
1.91
24.93%
At-fault driver_DUI
Yes
21.03%
4.03
52.72
18.06
−0.07%
−0.40%
2.36%
25.52
19.07
4.09
5.37
0.74
2.04%
1.70
25.51%
Gender
Male
−4.93%
18.19
−0.20%
25.52
19.07
4.09
5.37
0.00
0.00%
0.91
−4.01%
At-fault driver age
21 years old or younger
−3.59%
25.52
19.07
4.09
5.37
0.00
0.00%
0.00
−3.59%
22∼31 years old
−3.64%
55.94
20.21
−1.17%
−0.49%
25.52
19.07
4.09
5.37
0.00
1.94%
0.93
−0.77%
32∼41 years old
55.94
20.21
−1.00%
−0.49%
25.52
19.07
4.09
5.37
0.00
1.99%
0.93
2.93%
42∼51 years old
55.94
−0.58%
25.52
19.07
4.09
5.37
0.00
2.12%
0.00
2.12%
52∼61 years old
−3.36%
55.94
20.21
−0.71%
−0.45%
25.52
19.07
4.09
5.37
0.00
2.08%
0.95
−0.34%
62∼71 years old
55.94
−0.33%
25.52
19.07
4.09
5.37
0.00
2.19%
0.00
2.19%
Point of impact
Front passenger side
−3.96%
4.28
14.17
0.32%
−0.33%
25.52
19.07
4.09
5.37
0.96
0.00%
0.66
−2.34%
Back passenger side
−10.59%
14.17
−0.29%
25.52
19.07
4.09
5.37
0.00
0.00%
0.67
−9.92%
Bumper
20.19%
14.17
5.55%
25.52
19.07
4.09
5.37
0.00
0.00%
2.47
22.66%
Driver door
25.52
19.07
4.09
5.37
0.00
0.00%
0.00
0.00%
Passenger side behind the driver
−16.01%
25.52
19.07
4.09
5.37
0.00
0.00%
0.00
−16.01%
Causal vehicle type
Passenger car
−8.64%
48.32
1.82%
25.52
19.07
4.09
5.37
0.00
2.52%
0.00
−6.12%
Pickup
−10.57%
25.52
19.07
4.09
5.37
0.00
0.00%
0.00
−10.57%
SUV
−9.67%
25.52
19.07
4.09
5.37
0.00
0.00%
0.00
−9.67%
Noncausal vehicle type
Passenger car
−11.83%
5.59
−0.63%
25.52
19.07
4.09
5.37
0.79
0.00%
0.00
−11.04%
Pickup
−14.93%
25.52
19.07
4.09
5.37
0.00
0.00%
0.00
−14.93%
SUV
−11.30%
5.59
−0.23%
25.52
19.07
4.09
5.37
0.96
0.00%
0.00
−10.34%
Notes: Y2 is the KABC injury; Y1 is one of “ran stop sign (RSS),” “failed to yield at stop sign (FYSS),” or “failed to yield at turn (FYT)”; is the probability of Y1 when contributing factor X is at the base; is the probability of KABC injury when precrash behavior Y1 is at the base (i.e., “other behaviors”); ;; some cells are empty due to the insignificant estimates ( value >0.1) from the models.
