Evacuation Traffic Management under Diffusion of Toxic Gas Based on an Improved Road Risk Level Assessment Method

Table 4

Road risk level according to improved method.

Upstream zone	Downstream zone
	#1	#2	#3	#4	safe area
#1	24	22	20	18	16
#2	23	15	13	11	9
#3	21	14	8	6	4
#4	19	12	7	3	1
safe area	17	10	5	2	0