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