What lights are needed on the front of every trailer that is 80 inches or more in width?

Trailers that are 80 inches or more in width are required to have specific lighting to ensure visibility and safety on the road. The inclusion of 2 amber clearance lamps on the front of the trailer is mandated because these lamps serve a critical function. They help to delineate the width of the trailer, making it more visible to other drivers, especially during low light conditions or at night.

Amber clearance lamps are specifically used on the front of vehicles and trailers to indicate their overall width and prevent accidents by providing better visibility. The use of two lamps ensures that regardless of the angle from which another driver approaches, there is clear indication of the trailer's dimensions. This is particularly important for larger vehicles on busy roads where misjudging the size of a trailer could lead to dangerous situations.

The other options, while also related to lighting on vehicles, do not meet the specific requirement for width-related illumination on the front of trailers. Thus, the requirement for 2 amber clearance lamps is essential for compliance with safety standards and regulations for trailers of this size.