Estimation of Crash Severity on Mountainous Freeways in Chongqing

Table 1

Variable description.

Variable	Code	Frequency	Percentage (%)
Time	1 = 00:00~06:00	137	15.3
	2 = 06:00~12:00	261	29.1
	3 = 12:00~18:00	324	36.1
	4 = 18:00~24:00	176	19.5
Number of involved vehicles	1 = one vehicle	537	59.8
	2 = 2 or more vehicles	361	40.2
Season	1 = spring (March-April)	133	14.8
	2 = summer (May–Oct.)	420	46.8
	3 = autumn (Nov.)	50	5.6
	4 = winter (Dec.–Feb.)	295	32.8
Damage of properties	1 = damage of vehicle or road alone	590	65.7
	2 = damage of vehicle and road	308	34.3
Involvement of trucks	0 = no truck	600	66.8
	1 = truck involved	298	33.2
Public traffic vehicles	1 = yes	329	36.6
	2 = no	569	63.4
Accident form	1 = with fixed object	469	52.2
	2 = sideswipe	137	15.3
	3 = turnover	61	6.8
	4 = rear-end	231	25.7
Violation of speed limit	0 = within speed limit	817	91.0
	1 = beyond speed limit	81	9.0
Maximum driving experience of at-fault driver	1 = ≤1 year	80	8.9
	2 = 1–3 years	110	12.3
	3 = ≥3 years	708	78.8
Weather	1 = cloudy	57	6.4
	2 = sunny	568	63.3
	3 = rainy	248	27.6
	4 = snow	18	2.0
	5 = foggy	7	0.7
Section form	1 = straight	437	48.7
	2 = toll station	57	6.4
	3 = service area	53	5.9
	4 = upgrade	10	1.1
	5 = downgrade	24	2.7
	6 = ramp	4	0.5
	7 = curve	44	4.9
	8 = construction area	57	6.4
	9 = bridge	82	9.1
	10 = tunnel	130	14.3