What lighting is required on the back of a bus or trailer under 80" in width?

The requirement for lighting on the back of a bus or trailer that is under 80 inches in width specifies the need for two red tail-lamps and two red reflectors on each side. This arrangement ensures that the vehicle is visible from a distance, enhancing safety during low visibility conditions like nighttime or adverse weather. The red tail-lamps serve as crucial indicators of the vehicle's presence and intentions to other drivers, while the red reflectors amplify visibility when exposed to other vehicle headlights.

In terms of compliance with safety regulations, these specified features are crucial for reducing the risk of accidents by allowing following drivers to gauge the vehicle's dimensions and distance effectively. This regulation highlights the importance of adequate signaling and recognition of vehicles on the road, especially for larger vehicles like buses and trailers that can be more challenging to maneuver and see for other motorists.