Some alterations for safety purposes are permitted and do not cost judging points. Glass must be safety glass except in classes purely for unrestored, as-original cars. Many original vehicles from early in the period had only one tail light and stop light; fitting a second one is accepted as long as it looks period correct. Equipping a car built with only brakes on two wheels with brakes on the other two wheels is also permitted, as long it is done in keeping with the car's period.