Exploring Factors Affecting the Yellow-Light Running Behavior of Electric Bike Riders at Urban Intersections in China

Table 2

Definition of variables coded.

Variable	Definition	Type of variable
Gender (GEN)	0 for female; 1 for male	Categorical
Estimated age group^a (AGE)	0 for young group (<30)	Categorical
	1 for middle-age group (30–50)
	2 for old group (>50)
Vehicle type^b (VT)	0 for bicycle-style electric bike	Categorical
	1 for scooter-style electric bike
Physical barrier (PB)	0 for without physical barriers between motorized vehicle lane and nonmotorized vehicle lane	Categorical
	1 for with physical barriers between motorized vehicle lane and nonmotorized vehicle lane
Approaching speed (AS)	The approaching speed of vehicle at the onset of the yellow	Continuous
Distance to the stop bar (DTS)	Vehicle’s distance to the stop bar at the onset of the yellow indication	Continuous
Width of intersection (WI)	The distance between the stop line in the entrance of the intersection and the other invisible stop line in the exit of the intersection which is the extension cord of the opposite nonmotoried lane's stop line	Continuous

^aThe rider’s age information extracted from the recorded videos using the estimated age group could be more effective, and the group-dividing method was reported by Wu et al. [7]. ^bBicycle-style e-bike can be solely electric-powered or require pedal assistance, while the power of scooter-style e-bike only comes from the electromotor. The speed of the scooter-style e-bike is faster than the bicycle-style ones, and the features of each type are shown in Figure 3 [30].