Which of the following is not a requirement for trailers under 80 inches in width?

The correct answer indicates that side reflectors are not a requirement for trailers under 80 inches in width. This is significant in understanding vehicle safety standards and regulations pertaining to trailer equipment. For trailers of this size, the law specifies certain lighting and visibility features needed to ensure safety during operation, particularly during low-light conditions.

Two red stop-lamps and two red tail-lamps are essential for signaling braking and ensuring visibility from the rear. These lights are crucial for alerting other drivers on the road to the presence and actions of the trailer, promoting safety.

While side reflectors may be beneficial for visibility, they are not mandated for trailers that are narrower than 80 inches. This regulatory detail recognizes that different vehicle sizes have varying safety needs, and not all aspects of visibility are required for smaller trailers. Understanding these specifics helps ensure compliance with Texas regulations while also promoting safe driving practices.