Driving Risk Assessment in Work Zones Using Cloud Model

Table 4

Assessment indexes in concept cloud.

Work zones	Concept hierarchy assessing indicator	value	I	II	III	IV	Risk level		Risk score	Traffic conflicts
Work zone 1	a85	3.8	0	0.461	0.232	0	Less safe	13.48	48.48	42
	MSDE85	-4.3	0.265	0.023	0	0	safe	5.23
	CV	0.479	0	0	0.278	0.106	Less dangerous	17.65
Work zone 2	a85	5.3	0	0.879	0.011	0	Less dangerous	15.85	62.49	73
	MSDE85	-13.6	0	0	0.157	0.034	Less dangerous	16.03
	CV	0.436	0	0	0.653	0.041	Less dangerous	14.99
Work zone 3	a85	4.3	0	0.001	0.685	0	Less dangerous	5.32	34.33	31
	MSDE85	-6.4	0	0.003	0.864	0	safe	10.56
	CV	0.302	0	0.023	0.651	0	Less safe	9.96