RSA 266:38: Stop Lamps.

It shall be unlawful for any person to drive any motor vehicle, including any motorcycle, moped or motor-driven cycle, full trailer, trailer, or semi-trailer in this state unless it is equipped with one or more stop lamps in working order at all times; provided, however, that stop lamps shall not be required on a farm tractor, and further provided that whenever a vehicle is manufactured with multiple stop lamps or stop lamps with multiple bulbs or filaments, each of the lamps, bulbs, or filaments shall be in working order.