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Weathering is the adverse response of a material or product to climate, often causing unwanted and premature product failure. The research and literature review shows that, in addition to the standard signaling devices, the retro-reflective marking is intended to increase the visibility (recognition) over a wide range of distances and for an easy identification of vehicles. The main characteristics of retro-reflective marking are Type of material, Coefficient of retro-reflection, Efficiency, Colour, Aging, Soiling, Shape and Pattern. Materials used for the retro reflective materials offer an impressive range of attractive properties, however the effect of weathering conditions on the durability and performance of these materials are not fully understood. The initial study conducted to provide degradation effect on retro reflective material due to weathering and its effect on road safety by simulating the weathering conditions in the laboratory as a part of accelerated tests.

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.