Heavy cars require more energy when they accelerate. As a result, acceleration is limited & fuel consumption increased.
Glass windows in a car can, together, weigh up to 50 kilogrammes. Polycarbonate weighs half as much.
http://www.greencarreports.com/news/1082238_plastic-car-windows-one-way-to-save-weight / polycarbonate mass 100 pounds rear windows sunroofs too strong accident first responders breaking windows injured trapped occupants prohibited windscreens side windows scratch resistance hazing cost UV ultraviolet ultra violet ultra-violet protection protecting layers prevent hazing years sunlight additional layers prevent scratching twice double cost widely adopted company currently running trials /
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