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

Table 1

Conflicts according to the risk level, depending on the TTC value [16].

Risk probability	TTC (sec)	Description
0	≤0	Meaningless.
	>4.0	No conflict.
1	2.5 to 4.0	The accident-to-conflict ratio [17] (π) is about 0.2.
2	1.5 to 2.5	The accident-to-conflict ratio (π) is about 0.3.
3	1.0 to 1.5	The accident-to-conflict ratio (π) is about 0.6.
4	≤1.0	The accident-to-conflict ratio (π) is above 0.8.