Calculation of the Roadside Clear Zone Width along Highways Based on the Safe Slope

Table 5

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Vehicle type	Road type	Significant variable	Wilks’ lambda
			Lambda	Exact F
				Statistic	Df1	Df2	Sig
Truck	Straight	Slope gradient	0.566	61.782	1	79	0.000
		Departure speed	0.241	33.152	2	78	0.000
		Pavement height	0.013	29.328	3	77	0.000
	Curved	Pavement height	0.570	374.179	1	497	0.000
		Slope gradient	0.351	303.038	2	496	0.000
		Departure speed	0.118	240.553	3	495	0.000
		Horizontal curve radius	0.072	192.915	4	494	0.000
Car	Straight	Slope gradient	0.562	60.776	1	78	0.000
		Departure speed	0.251	36.127	2	77	0.000
		Pavement height	0.019	28.421	3	76	0.000
	Curved	Slope gradient	0.675	238.763	1	496	0.000
		Departure speed	0.431	189.493	2	495	0.000
		Pavement height	0.206	145.357	3	494	0.000
		Horizontal curve radius	0.108	103.672	4	493	0.000