Assessing the Effects of Interchange Warning Systems on Driving Risk: A Driving Simulator Study

Table 5

Mean score of all drivers under different scenarios.

Scenarios	IWS application	Mean score		Risk ranks
Ramp section (scenario 1)	Unapplied	65.00	66.46	L2
	Applied	67.92
Merging section (scenario 2)	Unapplied	61.34	63.43	L3
	Applied	65.52
Diverging section (scenario 3)	Unapplied	70.02	73.27	L1
	Applied	76.34
Ramp accident section (scenario 4)	Unapplied	53.34	55.31	L4
	Applied	57.28