Safety glass is a relatively mature feature in automotive history. The idea dates back to 1905, when Englishman John Crew Wood first patented laminated safety glass. Originally, tree resin was used to laminate the glass layers, and later, gelatin was used in safety glass products during the first world war. In 1927, knowing that glass injuries during otherwise minor car wrecks were shown to occur in a significant number of instances, automakers began manufacturing cars incorporating safety glass". There are two main forms of safety glass:
Windshield glass replacement is nearly always covered by auto insurance, usually with a reasonable copayment (often $100 in the US). Many companies also reimburse for repair or replacement of cracked windshield depending upon the degree of damage. Overall, it is safe to say that safety glass provides a clear advantage for drivers.