Variable Speed Limit Strategies Based on the Macro Hierarchical Control Traffic Flow Model

Table 1

Table of definitions of variables.

Variables	The definitions of variables
	A period of time,
	It is the length of segment
	It is the number of lanes on segment
	The sampling period
	The free flow speed
	The traffic jam density
	The critical density
	Model parameters
	At time , on segment , the vehicle density (veh/km/Lane)
	At time , on segment , the entrance ramp traffic flow
	At time , on segment , the exit ramp traffic flow
	At time , on segment , the average speed of vehicles (km/h)
	At time , on segment , the queue length
	At time , on segment , the traffic demand
	At time , on segment , the number of vehicles (veh/h/lane)
	At time , on segment , the limited speed