What is the minimum number of red stop lamps required for a truck or bus?

The minimum number of red stop lamps required for a truck or bus is one. This regulation ensures that vehicles have at least one visible signal to inform others on the road when the vehicle is coming to a stop. The presence of a red stop lamp is crucial for safety, as it alerts drivers behind the vehicle of its intention to stop, which helps prevent rear-end collisions. Although some vehicles may have more than one stop lamp for increased visibility, the law stipulates that having at least one functioning red stop lamp is essential for compliance and safety on the road. This requirement is aimed at maintaining clear communication among drivers, especially in high-traffic or low-visibility situations.