Development of Degree-of-Priority Based Control Strategy for Emergency Vehicle Preemption Operation

Table 4

Parameters of control strategy in evaluation.

Parameters	Symbol	Value
Conversion coefficient of casualties	𝐿𝑘^(𝑃)	70
Road section clearance time	Δ𝑡𝑘	When 𝐷𝑝<0.4  Δ𝑡𝑘=3; When 0.4<𝐷𝑝<0.7  Δ𝑡𝑘=6; Else Δ𝑡𝑘=20
Lane clear influence coefficient	𝛽	1
Ratio of lane-clear speed	𝜇	135.7
Coefficients of BPR function	𝑎	1.96
Coefficients of BPR function	𝑏	1.59
Degree-of-priority adjusting coefficients	𝜂	[10, 50, 100, 200]