Study on Drivers’ Visual Load Features in Lighting Environments of Interior Zones of Extra-Long Tunnels over 10 km

Table 1

Characteristic parameters of the tunnels.

Tunnel name	Total length (m)	Length of interior zone (m)	Light arrangement	Lighting devices
Nanwutai	2564	2267	Symmetrical lighting on both sides	Yellow high-pressure sodium lamp
Huangtuliang	230	134	Lighting on one side	Yellow high-pressure sodium lamp
Qingcha	1800	1503	Symmetrical lighting on both sides	Yellow high-pressure sodium lamp
Qinling	18020	17567	Symmetrical lighting on both sides	Yellow high-pressure sodium lamp