What lights are required on the side of a bus or trailer that is less than 80 inches in width?

For a bus or trailer that is less than 80 inches in width, there are indeed specific lighting requirements that must be met to ensure safety and visibility on the road. Vehicles of this width are not mandated to have side marker lamps or clearance lamps like larger vehicles.

The absence of lighting requirements for narrower vehicles aligns with regulations that focus on the size and visibility of larger vehicles, which need more extensive illumination due to their size and the greater risks they pose in traffic. This means that a bus or trailer below this width does not need to have any side lights or reflectors, as the risks associated with their visibility are considered manageable without this added equipment.

The other options, while they represent various lighting configurations, are not necessary for vehicles that are under the 80 inches width threshold, confirming that no additional requirements apply in this specific case.