Developing a Traffic Management Framework for Coastal Expressway Bridges under Adverse Weather Conditions: Case Study of Rain Day in Shenzhen, China

Table 4

Grades of freeway LOS in China and the implementation criteria for ERC.

LOS	1	2	3	4
Operation status of traffic flow	Free flow	Steady flow	Congested flow	Blocked flow
Volume to capacity ratio
Description of LOS	Pretty good	Good	General	Low
The ERC strategy	NA	NA	Should be considered or implemented	Should be implemented
Descriptions of the ERC strategy utilized in GSCE-SS			Grade B	Grade A
Grade B: consider banning hazardous material vehicles, buses, container trucks, and motorcar with disabled taillights from entering the freeway; conduct verbal warnings to drivers to turn on clearance lamps and hazard warning lamps, to keep the space, and to navigate with caution.
Grade A: ban hazardous material vehicles, buses, container trucks, and motorcars with disabled taillights from entering the freeway; conduct compulsive requirements to drivers to turn on clearance lamps and hazard warning lamps, no overtaking, to keep the space, and to navigate with caution.