RT-1 applies to car bodies for newly constructed light-rail vehicles and streetcars for transit passenger service. RT-1 defines requirements for the incorporation of passive safety design concepts related to the performance of the car body of light-rail vehicles in conditions such as collisions, so as to enhance occupant safety and control damage. RT-1 joins with RT-2-2014 Safety Standard for Structural Requirements for Heavy Rail Transit Vehicles, to serve as the first standards of their kind for North America. The result is a pair of uniform standards suitable for adoption by all levels of domestic jurisdiction, while providing state-of-the-art guidelines for other nations considering carbody standards for their rail-transit systems.