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

Table 7

Classification and coding of risk features.

Feature categories		Features	Feature codes and range
Degree of risk		Driving risk	[42.4, 83.6]
IWS arrangements		IWS	0 = unapplied, 1 = applied
Driver behavioral characteristics	Operation behavior	Mean speed (km/h)	[24.82, 114.20]
		Speed SD (km/h)	[0.08, 44.9]
		Acceleration SD (m/s^2)	[0.01, 3.34]
		Mean brake pedal depth	[0, 10.26]
		Maximum brake pedal depth	[0, 20.00]
		Brake pedal depth SD	[0, 9.97]
	Eye movement behavior	Mean saccade amplitude (°)	[0, 8.45]
		Mean saccade velocity (°/s)	[0, 191.23]