Study on the Annual Reduction Rate of Vehicle Emission Factors for Carbon Monoxide: A Case Study of Urban Road Tunnels in Shenzhen, China

Table 1

Main design parameters of the four tunnels.

Tunnel name	Location	Length (m)	Design speed (km/h)	Road grade	Ventilation design
Henglongshan Tunnel	Fulong Road	Left bore: 2330	60	Urban expressway (two-bore six-lane)	Main tunnels: 24 jet fans
		Right bore: 2275			Ramps: 6 jet fans
Cejiexian Tunnel	Shenzhen Western Corridor	Main bore: 4480	80	Highway (two-bore six-lane)	Left bore: 100 jet fans
					Right bore: 66 jet fans
Jiuweiling Tunnel	Danping Expressway	Left bore: 1472	80	Urban expressway (two-bore six-lane)	Left bore: 1 shaft and 6 jet fans
		Right bore: 1447			Right bore: 22 jet fans
Dameisha Tunnel	Dameisha Road	Left bore: 1521	60	Highway (two-bore six-lane)	Left bore: 12 jet fans
		Right bore: 1540			Right bore: 6 jet fans