Interpreting risk factors for truck crash severity on mountainous freeways in Jiangxi and Shaanxi, China

Wang, Yonggang; Luo, Ye; Chen, Fayu

doi:10.1186/s12544-019-0366-4

European Transport Research Review

An Open Access Journal

Table 1 Description of explanatory variables

From: Interpreting risk factors for truck crash severity on mountainous freeways in Jiangxi and Shaanxi, China

Explanatory Variable	PDO		Injury		Fatality		Total
Explanatory Variable	N	%	N	%	N	%	N
Total Crash	629	53.53	386	32.85	160	13.62	1175
Driver characteristics
Gender
Female^a	22	1.87	34	2.89	18	1.53	74
Male	607	51.66	352	29.96	142	12.09	1101
Age
Young (< 30 years)^a	120	10.21	59	5.02	24	2.04	203
Adult (30~50 years)	440	37.45	253	21.53	99	8.43	792
Old (> 50 years)	69	5.87	74	6.30	37	3.15	180
Seatbelt status
Used^a	531	45.19	212	18.04	67	5.70	810
Not used	98	8.34	174	14.81	93	7.91	365
Vehicle attributes
Number of vehicle involved
Single^a	244	20.76	89	7.57	43	3.66	376
Multiple	385	32.77	297	25.28	117	9.96	799
Type of vehicle
Commercial transport	629	53.53	355	30.21	139	11.83	1123
Others^a	0	0	31	2.64	21	1.79	52
Conditions of freight
Not overloading^a	531	45.19	151	12.85	3	0.26	685
Overloading	98	8.34	235	20.00	157	13.36	490
Brake system
Not failed^a	384	32.68	143	12.17	33	2.81	560
Failed	245	20.85	243	20.68	127	10.81	615
Roadway speed limit
Regarding^a	511	43.49	152	12.94	7	0.60	670
Disregarding	118	10.04	234	19.91	153	13.02	505
Following distance
Safe^a	388	33.02	83	7.06	18	1.53	489
Unsafe	241	20.51	303	25.79	142	12.09	686
Road geometrics
Horizontal alignment
Straight^a	332	28.25	153	13.02	15	1.28	500
Curve	297	25.28	233	19.83	145	12.34	675
Vertical alignment
Level^a	99	8.42	102	8.68	55	4.68	256
Upgrade	43	3.66	36	3.06	18	1.53	97
Downgrade	487	41.45	248	21.11	87	7.41	822
Environmental conditions
Season
Spring^a	184	15.66	37	3.15	0	0	221
Summer	123	10.47	133	11.32	25	2.13	281
Autumn	189	16.08	18	1.53	8	0.68	215
Winter	133	11.32	198	16.85	127	10.81	458
Day of week
Weekends/holidays^a	157	13.36	138	11.74	46	3.92	341
Weekday	472	40.17	248	21.11	114	9.70	834
Time of crash
Daytime^a	538	45.79	205	17.45	19	1.62	762
Nighttime	91	7.74	181	15.40	141	12.00	413
Weather
Fine^a	552	46.98	205	17.45	13	1.11	770
Adverse	77	6.55	181	15.40	147	12.51	405

^aReference category

Back to article page