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Visibility through windscreen along with front lighting system is one of the most important elements of road safety. Windscreen also provides the good visibility to driver to drive safely during night time. As per the rule windscreen visual light transmission should be minimum 70%. Windshields are made-up of tinted glass which produces light transmission varying from 70% to 95%. Windscreen installation is various from vehicle to vehicle, the visual light transmittance at different installation angle and its effect to the visibility are not fully understood. Vehicle headlamps and front fog lamps are evaluated for the illumination without consideration of driver's visibility with the combination of wind screen and its installation angle. This paper describes the effect of different ranges of tinted wind shield glass on driver's visibility at various installation angle of windshield along with the headlamp illumination.

The paper contains experimental results related to the driver's visibility and polarized headlighting system. The interpretation of visibility is done in terms of contrast in almost every situation. Results showing the variation of high and low beam intensity as a function of lateral displacement between the vehicles are presented. Parameters like headlamp mounting height and height of driver's eye point (DEP) have also been considered. A comparative study between polarized and conventional headlighting systems is performed under different situations. The performance metrics chosen for this purpose are visibility and glare.