What must a trailer have to be visible from a distance of 1,000 feet?

A trailer must meet specific visibility requirements to ensure it can be seen clearly by other drivers, especially at night or in low-visibility conditions. The requirement for a trailer to be visible from a distance of 1,000 feet includes having turn signals, stop lights, two red reflectors, and two red taillights mounted on the rear. This combination of lights and reflectors helps to convey various signals to other drivers, such as intentions to stop or change lanes, thereby enhancing safety on the road.

The presence of turn signals and stop lights indicates when the trailer is about to change direction or make a stop, while the red reflectors and taillights ensure that the trailer is visible from behind, particularly in the dark. These elements work together to create a clear visual signal to other drivers, decreasing the chances of accidents.

In contrast, the other choices do not fulfill the complete set of requirements for rear visibility. Just having turn signals and side markers or one red reflector does not provide enough visibility, particularly at a distance of 1,000 feet. Only having two red reflectors and two amber lights would also fail to meet the safety standards necessary for trailers on the road.