Every bus or truck must be equipped on the rear with:

The requirement for buses and trucks to be equipped with two stop lights on the rear is based on safety regulations designed to ensure visibility and communication with other drivers on the road. The presence of two stop lights enhances the visibility of the vehicle's intention to stop or slow down, which is particularly important given the larger size and slower response times of buses and trucks compared to smaller vehicles.

Two stop lights provide a more effective warning to drivers behind the vehicle, reducing the likelihood of rear-end collisions. This standard aligns with broader vehicle safety regulations, promoting a consistent approach to vehicle equipment across different types of motor vehicles. Having only one stop light would not provide adequate indication to other drivers or meet the necessary safety standards expected for larger vehicles.