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International Journal of Photoenergy
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International Journal of Photoenergy
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2015
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Article
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Tab 2
/
Research Article
Design of Solar Optical Fiber Lighting System for Enhanced Lighting in Highway Tunnel Threshold Zone: A Case Study of Huashuyan Tunnel in China
Table 2
The stopping sight distance
for highway tunnel lighting (m).
Design speed (km/h)
Longitudinal slope (°)
−4
−3
−2
−1
0
1
2
3
4
100
179
173
168
163
158
154
149
145
142
80
112
110
106
103
100
98
95
93
90
60
62
60
58
57
56
55
54
53
52
40
29
28
27
27
26
26
25
25
25