Safety Evaluation for Connected and Autonomous Vehicles’ Exclusive Lanes considering Penetrate Ratios and Impact of Trucks Using Surrogate Safety Measures

Table 4

Safety impacts of setting exclusive lanes compared with the base scenario.

MPRs = 10%	Trucks (%)	2000 veh/h		4000 veh/h		6000 veh/h		8000 veh/h
		TET (%)	LCC (%)	TET (%)	LCC (%)	TET (%)	LCC (%)	TET (%)	LCC (%)
1 exclusive lane	0	−20.5	19.5	−40.4	8.7	−42.4	11.0	11.6	7.9
	10	−7.6	8.1	−38.8	6.6	−24.4	17.1	19.7	13.8
	20	−7.0	13.9	−32.1	9.4	−5.2	23.0	29.6	21.8
	30	1.8	28.3	−17.5	28.9	9.6	27.6	36.5	16.6
2 exclusive lanes	0	−24.9	30.5	−44.7	26.1	−25.1	4.5	14.1	18.6
	10	−14.2	21.0	−45.7	30.9	−11.6	73.6	27.0	59.7
	20	−12.5	30.6	−39.0	29.8	4.9	47.8	35.9	56.9
	30	−2.3	34.8	−22.8	35.2	18.5	45.1	42.9	48.6
MPRs = 20%	Trucks (%)	2000 veh/h		4000 veh/h		6000 veh/h		8000 veh/h
		TET (%)	LCC (%)	TET (%)	LCC (%)	TET (%)	LCC (%)	TET (%)	LCC (%)
1 exclusive lane	0	18.6	2.6	6.8	1.8	3.5	70.5	39.5	15.0
	10	28.9	17.4	11.2	16.5	14.8	39.8	35.0	19.7
	20	29.9	10.0	16.0	9.8	18.7	24.0	42.4	39.6
	30	38.1	32.6	23.9	32.4	30.0	2.9	47.5	39.7
2 exclusive lanes	0	17.1	3.2	4.4	2.1	8.6	74.0	42.4	4.1
	10	25.9	26.1	5.8	26.6	14.9	55.7	41.8	65.5
	20	27.1	25.0	10.8	26.2	27.4	58.1	49.3	68.3
	30	35.0	45.7	19.8	46.0	37.3	45.1	53.8	67.9
MPRs = 30%	Trucks (%)	2000 veh/h		4000 veh/h		6000 veh/h		8000 veh/h
		TET (%)	LCC (%)	TET (%)	LCC (%)	TET (%)	LCC (%)	TET (%)	LCC (%)
1 exclusive lane	0	31.5	61.3	23.9	61.7	24.3	87.1	29.1	23.8
	10	40.7	4.0	27.8	3.9	25.9	60.4	32.9	52.8
	20	44.3	12.5	32.8	11.1	31.2	42.1	40.4	57.8
	30	52.9	14.3	40.1	13.8	36.5	50.8	45.1	54.3
2 exclusive lanes	0	31.7	38.7	24.4	38.3	25.6	85.3	35.2	33.1
	10	39.0	12.0	26.2	10.5	25.9	59.6	43.4	77.1
	20	43.0	37.5	30.9	36.1	33.4	47.4	50.5	77.6
	30	51.1	28.6	38.7	27.7	42.5	51.7	55.2	77.6