Research on the Evolution Mechanism of Congestion in the Entrances and Exits of Parking Facilities Based on the Improved Spatial Autoregressive Model

Table 2

Definition of the traffic status of the space unit (unit: km/h).

Status	Disturbance range	Speed range	Description
Spontaneously congested unit			Congestion occurs first
Heavily congested unit	>20	<10	Vehicles are in a queue
Moderately congested unit	10∼20	10∼20	Low speed with a standstill
Lightly congested unit	0∼10	20∼30	Moderate speed with no standstill
Immune unit	≤0	>30	Faster speed in a free-flow state