Abstract
The preliminary investigations by the Ministry of Transportation of Ontario into the possibility of using transparent sheet glazing products made of glass or plastic in noise barriers are documented. The political issues and principles of using these types of barriers are not addressed. The concerns of the Design Development and Application Section with regard to the ability of various substances to meet current standards for noise barrier materials are discussed, providing a substantial foundation for establishing standards with regard to properties unique to glass or plastic such as transparency, flammability, safety under impact, and design considerations.