 Vehicles in both classes also must have features expected of a modern automobile including an enclosed cabin with windshield and windows, operating windshield wipers, washers, headlights, horn, indicators, brake lights, reflective devices, rear and side-view mirrors, and seat belts.They must have the usual automotive controls, including accelerator pedal, brake pedal, steering mechanism (not necessarily a wheel) and indicators.They must be "highway capable", which is defined as the ability to maintain on a four percent uphill grade and to accelerate from to in less than 9 seconds.