Driver Behavior on Combination of Vertical and Horizontal Curves of Mountainous Freeways

Table 9

Speed prediction model of different size vehicles in different lanes of mountainous freeway.

Vehicle size	Feature cross-sections	Road alignment	Lane	Prediction model	Road parameters
		𝑅𝑏  𝑅𝑐  𝑅𝑛
S	Midpoint	S + C + C	a	𝑣𝑚a=0.7𝑣𝑖a+3.5×10^−2𝑅𝑐+3𝐺𝑐	170≤𝑅𝑐≤350; 1≤𝐺𝑐≤2.5
			b	𝑣𝑚b=0.85𝑣𝑖b+3.8×10^−2𝑅𝑐+1.8𝐺𝑐
		C + C + S	a	𝑣𝑚a=0.7𝑣𝑖a+3.5×10^−2𝑅𝑐+3𝐺𝑐	170≤𝑅𝑐≤350; 1≤𝐺𝑐≤2.5
			b	𝑣𝑚b=0.85𝑣𝑖b+3.8×10^−2𝑅𝑐+1.8𝐺𝑐
	Exit	S + C + C	a	𝑣𝑜a=0.7𝑣𝑚a+4.5×10^−2𝑅𝑐+1.8𝐺𝑐+2.8×10^−2𝑅𝑛+3𝐺𝑛	170≤𝑅𝑐≤350; 350≤𝑅𝑛≤500; 1≤𝐺𝑐,𝐺𝑛≤2.5
			b	𝑣𝑜b=0.85𝑣𝑚b+3.5×10^−2𝑅𝑐+1.8𝐺𝑐+2×10^−2𝑅𝑛+3𝐺𝑛
		C + C + S	a	𝑣𝑜a=0.7𝑣𝑚a+4.5×10^−2𝑅𝑐+1.8𝐺𝑐+3𝐺𝑛	170≤𝑅𝑐≤350; 1≤𝐺𝑐,𝐺𝑛≤2.5
			b	𝑣𝑜b=0.85𝑣𝑚b+3.5×10^−2𝑅𝑐+1.8𝐺𝑐+3𝐺𝑛
L	Midpoint	S + C + C	a	𝑣𝑚a=0.7𝑣𝑖a+5×10^−2𝑅𝑐+2.3𝐺𝑐	170≤𝑅𝑐≤350; 1≤𝐺𝑐≤2.5
			b	𝑣𝑚b=0.85𝑣𝑖b+3.2×10^−2𝑅𝑐+2𝐺𝑐
		C + C + S	a	𝑣𝑚a=0.7𝑣𝑖a+5×10^−2𝑅𝑐+2.3𝐺𝑐	170≤𝑅𝑐≤350; 1≤𝐺𝑐≤2.5
			b	𝑣𝑚b=0.85𝑣𝑖b+3.2×10^−2𝑅𝑐+2𝐺𝑐
	Exit	S + C + C	a	𝑣𝑜a=0.7𝑣𝑚a+3.5×10^−2𝑅𝑐+2𝐺𝑐+2.5×10^−2𝑅𝑛+2.5𝐺𝑛	170≤𝑅𝑐≤350; 350≤𝑅𝑛≤500; 1≤𝐺𝑐,𝐺𝑛≤2.5
			b	𝑣𝑜b=0.85𝑣𝑚b+3×10^−2𝑅𝑐+2.2𝐺𝑐+2.3×10^−2𝑅𝑛+2.5𝐺𝑛
		C + C + S	a	𝑣𝑜a=0.7𝑣𝑚a+3.5×10^−2𝑅𝑐+2𝐺𝑐+2.5𝐺𝑛	170≤𝑅𝑐≤350; 1≤𝐺𝑐,𝐺𝑛≤2.5
			b	𝑣𝑜b=0.85𝑣𝑚b+3×10^−2𝑅𝑐+2.2𝐺𝑐+2.5𝐺𝑛