Driving Risk Detection Model of Deceleration Zone in Expressway Based on Generalized Regression Neural Network

Table 1

Set of characterization indicators for driving risk.

Variable name	Unit	Indicators	Description
	s	Reaction time	It characterizes the zone time between the drivers' reading the speed limit sign and vehicles slowing down.
	m/s	Initial speed	It characterizes the speed at which the driver finds the speed limit sign.
	m/s	Final speed	It characterizes the speed which the driver can keep after the deceleration is completed.
	m/s	Velocity difference	It characterizes the change in speed for the driver after seeing the speed limit sign.
	m/s^2	Acceleration	It characterizes the rate of the speed change during deceleration.