11. Warning signs are often used where sight distance is insufficient. 12. It is also important on minor roadways for safety considerations such as driver sight distance . 13. The line of sight distance " d " of this station is given by the Pythagorean theorem; 14. Thus, the maximum service range of the station, is not equal to the line of sight distance . 15. Minimum sight distances were kept at. 16. Lower speed roads can have sharper curves, less banking, less sight distance , and sharper hill crests and valleys. 17. It is characterized by sharp curves, limited sight distance , narrow shoulders, and lack of merge lanes at interchanges. 18. The desired stopping sight distance ( S ) is determined by the speed of traffic on a road. 19. The proper equation depends on whether the vertical curve is shorter or longer than the available sight distance . 20. Before releasing the accident scene and allowing restoration of service, the NTSB also conducted a final sight distance test.
