This report describes the research outcomes of a review examining the link between windscreen degradation and road safety. Different types of windscreen damage were identified including sudden impact damage such as cracks and "bulls eyes" and gradual degradation resulting from the constant wear of the surface by small particles such as sand and dirt. The effect of gradual degradation on driving safety has been the focus of this project. A review of the international literature identified a number of studies that suggest that windscreen degradation may impair driver perception. Little research was identified that directly examined the link between windscreen degradation and crash involvement. Relevant national and international standards, regulations and guidelines relating to windscreens were summarised, and devices that can measure windscreen degradation were identified. Finally, recommendations were made for the future direction of the project. (Author/publisher)
Abstract