Under what conditions can a load extend more than 4 feet beyond the rear of a vehicle?

The correct choice indicates that a load can extend more than 4 feet beyond the rear of a vehicle if it is specifically designed to be carried at the rear of the trailer. This means that the load must be suitable for hanging or extending beyond the vehicle dimensions without compromising safety or stability.

Loads like certain types of construction materials or equipment often have specific design features that allow them to be safely transported in this way. This may also indicate compliance with regulatory guidelines that often mandate particular handling requirements for such loads.

In contrast, the conditions referring to weight, proper securing, or visibility do play important roles in overall transportation safety but do not directly allow for exemptions to the standard rule regarding load extension. A lightweight load can still be hazardous if not configured correctly; a securely fastened load is essential for safety no matter the extension; and a load that blocks visibility might create dangerous situations, regardless of its design or purpose. Therefore, these factors do not provide a legitimate basis for exceeding the 4-foot limit beyond the rear of a vehicle.