Every bus or truck must be equipped with how many stop lights on the rear?

Answer: B — Two

The requirement for every bus or truck to be equipped with two stop lights on the rear is based on safety standards aimed at ensuring visibility and signaling to other drivers when the vehicle is coming to a stop. Having two stop lights increases the likelihood that other drivers will see the signals, providing a more effective warning system. This is especially important for larger vehicles like buses and trucks, which require more distance and time to stop compared to smaller vehicles. In addition, state and federal regulations typically stipulate this two-stop-light requirement to enhance safety on the road, making it essential for commercial drivers to comply with these standards. Other options provide fewer stop lights, which could compromise visibility and safety, as one light may not be sufficient for other motorists to easily notice that the vehicle is stopping.