Crash Risk Prediction Model of Lane-Change Behavior on Approaching Intersections

Table 3

The risk coefficient of TTC and DRAC at different risk levels.

Risk level	Conflict Risk Indices		Description	Risk; coefficient
	TTC (s)	DRAC (m/s^2)
No conflict	≤0	0	No safety risk	0
No conflict	>4.0	0 to 1	No relationship between safety and indices
1	2.5 to 4.0	1 to 2	The accident-to-conflict ratio is stable	0.2
2	1.5 to 2.5	2 to 4	Low risk level	0.3
3	1.0 to 1.5	4 to 6	Moderate risk level	0.6
4	≤1.0	≥6	High risk level	0.8