Investigating Contributing Factors on Aggressive Driving Based on a Structural Equation Model

Table 2

Description of variables.

Category	Item	Description
Driver characteristic	Sex	Sex
	Age	Age
	Distracted driving	The act or practice of driving while engaged in other activities
	Drowsy driving	The state of the driver when he/she is driving with sleepiness or fatigue, symbolized by, e.g., yawning or blinking frequently
Road environment	Weather	Weather
	Horizontal curve	Mainly divided by curve
	Profile	Mainly divided by slope
	Traffic flow (TF)	Mainly divided by traffic
Vehicle driving characteristic	Speed	Speed
	Longitude acceleration (LO-ACC)	The longitudinal acceleration rate is the acceleration rate in the direction of the vehicles longitudinal axis (“+” means acceleration, while “−” means braking)
	Lateral acceleration (LA-ACC)	Lateral acceleration is the acceleration rate in the cross-sectional direction of the road
Aggressive vehicle control (AVC)	Aggressive lateral acceleration (ALA-ACC)	Defined by lateral acceleration
	Aggressive longitudinal acceleration (ALO-ACC)	Defined by longitudinal acceleration
Risky scenario characteristics (RSC)	Aggressive TTC (ATT)	TTC <1 sec (TTC refers to the time required for two vehicles to collide if they continue at their present course and speed)
	Speeding	Speed >120 km/h (The speeding state measures whether the vehicle is speeding)