Design of Solar Optical Fiber Lighting System for Enhanced Lighting in Highway Tunnel Threshold Zone: A Case Study of Huashuyan Tunnel in China

Table 3

The reduction coefficient of the luminance in the threshold zone .

Design traffic volume (v/h)
		Design speed (km/h)
Two-lane two-way traffic	Two-lane one-way traffic	100	80	60	40
≥2400	≥700	0.045	0.035	0.022	0.012
≥1300	≥360	0.035	0.025	0.015	0.01