Windshields are subject to wear and tear which leads to stray light values which, according to legal court demands, engender unusually slow speed limits. They disregard reality.

Windshields must be considered as a wear and tear part insofar as their condition as regards traffic safety is variable and unreliably predictable so that a periodical inspection within the meaning of § 29 of the Motor Vehicle Approval and Traffic Registration Code (=StVZO) is necessary for the preservation of traffic safety.