In some previous investigations into night driving problem carried out from this department the relative visible distances for different conditions were the main interest. In the experiments reported here a more realistic method is used and the absolute values are of interest. What is measured is available braking distance (visible distance minus reaction distance). Three conditions were investigated: 1) Two meeting cars both using continental European asymmetrical dipped headlights; 2) Two meeting cars both using full headlights; 3) One car using continental European asymmetrical dipped headlights with no meeting car. The results show that for velocities over about 20-30 mph. the available braking distance is short than the braking distance (distance needed to brake a full stop) for all conditions tested. The conclusion drawn is that accidents involving pedestrians cyclists etc. in night driving are unavailable with the car lighting systems and the speeds used at present.
Abstract