Fig. 1. Luminous objects with fixed distance intervals on one side of highway

Fig. 2. Luminance change of luminous object at distance of 50 m in different visibility.(a) Visibility 590 m; (b) visibility 321 m; (c) visibility 156 m

Fig. 3. Luminance and standard deviation of luminous object at distance of 50 m in different visibility.(a) Visibility 590 m; (b) visibility 321 m; (c) visibility 156 m

Fig. 4. Luminance change of luminous object at distance of 100 m in different visibility.(a) Visibility 590 m; (b) visibility 321 m; (c) visibility 156 m

Fig. 5. Luminance and standard deviation of luminous object at distance of 100 m in different visibility.(a) Visibility 590 m; (b) visibility 321 m; (c) visibility 156 m

Fig. 6. Luminance change of luminous object at distance of 200 m in different visibility.(a) Visibility 590 m; (b) visibility 321 m; (c) visibility 156 m

Fig. 7. Luminance and standard deviation of luminous object at distance of 200 m in different visibility.(a) Visibility 590 m; (b) visibility 321 m; (c) visibility 156 m

Fig. 8. Luminance area division of luminous object at distance at different distances with visibility of 200 m.(a) Distance of 50 m; (b) distance of 100 m; (c) distance of 200 m

Fig. 9. Luminance and standard deviation of luminous object with different distance and visibility.(a) Distance of 50 m; (b) distance of 100 m; (c) distance of 200 m