An Analysis of the Catastrophe Model and Catastrophe Characteristics of Traffic Flow Based on Cusp Catastrophe Theory

Table 2

Meaning of parameters in equations (3) and (4).

Parameter	Parameter meaning	Unit
N	Standard vehicle number	pcu
qi (i = 1, 2)	Traffic volume	pcu/h
(i = 1, 2)	Traffic flow velocity	m/s
ki (i = 1, 2)	Traffic flow density	pcu/km
	Traffic wave velocity	m/s
T	Running time	s