Predicting Severity and Duration of Road Traffic Accident

Table 1

Variables and statistics based on survey data.

Factors	Variables	Values	Percentage (%)	Variables	Values	Percentage (%)
Accident severity	Number of fatalities: Nof	0	89.59	Number of injuries: Noi	0	9.86
		[1,2]	10.38		[1, 3)	85.89
		More than 3	0.03		[3, 11)	4.14
	Property damage (yuan): Pd	Less than 1000	61.18		Over 11	0.11
		[1001, 30000)	37.19
		Over 30000	1.63
Duration	Duration; (Continuous value)	Mean (min) 192.95	Standard deviation 111.63
Accident characteristics	Motor-vehicle-only accident: Mvoa	Yes	57.41	Vehicle fire: Vf	Yes	8.93
		No	42.59		No	91.07
	Head-on type collision: Hotc	Yes	8.93	Weekend or festival: Wof	Yes	38.60
		No	91.07		No	61.40
	Rear-end type collision: Retc	Yes	19.64	Vehicle rollover: Vr	Yes	26.79
		No	80.36		No	73.21
	Time of day: Tod	[00:00, 6:00)	6.24	Number of lanes blocked: Nolb	0	3.57
		[6:00, 18:00)	69.12		1	62.50
		[18:00, 24:00)	24.64		over 1	33.93
Vehicle characteristics	Bus involved: Bi	Yes	16.07	Hazardous material involved: Hmi	Yes	1.79
		No	83.93		No	98.21
	Truck involved: Ti	Yes	89.29	Disabled vehicles involved: Dvi	Yes	27.27
		No	10.71		No	72.73
	Debris involved: Di	Yes	53.57
		No	46.43
Environmental factors	Weather conditions: Wc	Sunny	89.48	Visibility distance (meter): Vd	Less than 50	8.90
		Fog	0.23		[50, 100)	22.70
		Sleet	5.97		[100, 200)	19.86
		Other	4.32		Over 200	48.54
Road environment factors	Number of lanes in each direction: Nol	2	33.92		Motor vehicle lanes	71.68
		3	51.79		Bike lane	6.60
		Over 3	14.29	Accident location (horizontal): Alh	Shared motor vehicle and bike lane	13.71
	Pavement condition: Pc	Asphalt	96.95		Sidewalk	2.22
		Cement	2.85		Crosswalk	3.42
		Sand and gravel	0.07		Other	2.37
		Soil	0.07		Regular road section	60.01
		Other	0.06	Accident location (vertical): Alv	Four-way intersection	20.43
	Roadway surface condition: Rsc	Dry	85.16		Other road sections (narrow carriageway and tunnel, etc.)	1.09
		Wet	6.38		Other intersections	18.47
		Slippery (snowy or icy conditions)	6.76	Road geometrics: Rg	Flat and straight	98.57
		Other	1.70		Hill or bend	1.43
	Traffic signal control: Tsc	Yes	17.46
		No	82.54
Emergency services	Police services: Ps	Yes	71.43	Fire and rescue services: Frs	Yes	16.07
		No	28.57		No	83.93
	Tow services: Ts	Yes	98.21	Emergency medical services: Ems	Yes	33.93
		No	1.79		No	66.07