Analysis of Factors Affecting Road Transport Accidents of Hazardous Materials Based on PG-BN

Table 1

Study variables.

Node	Symbols	Node status
Driver status	R1	Normal
		Improper_operation
		Fatigue_driving
		Else
Vehicle type	C1	Truck
		Tank
		Trailer
		Else
Whether overload	C2	Yes
		No
Hazmat categories	W1	Toxic_gas
		Corrosives
		Flammable_liquid
		Explosives
		Else
Quantity of hazmat (t)	W2	Less_than_10
		Between_10_and_30
		More_than_30
Intersection type	D1	Ordinary_intersection
		Three_branch_intersection
		Four_branch_intersection
		Else
Road condition	D2	Normal
		Roadblock
		Else
Road type	D3	Expressway
		Class_I_Highway
		Class_II_Highway
		Class_III_Highway
		Class_IV_Highway
		Urban_road
		Else
Weather	H1	Sunny
		Overcast
		Rainy_or_snowy
		Smog
		Else
Visibility (m)	H2	Less_than_50
		Between_50_and_100
		Between_100_and_200
		More_than_200
Lighting		Day
		Night_light
		Night_no_light
Accident severity	S1	Minor_accident
		General_accident
		Serious_accident
		Major_accident
Accident processing time (min)	S2	Less_than_30
		Between_30_and_60
		Between_60_and_120
		More_than_120