Under normal atmospheric conditions, clearance lights must be visible from a distance of how many feet?

Answer: C — 900 ft

Clearance lights must be visible from a distance of 500 feet under normal atmospheric conditions. This requirement ensures that other drivers can see the vehicle from a sufficient distance, particularly in low-light conditions, which enhances safety on the road. Visibility from 500 feet allows for adequate reaction time for surrounding traffic, signaling the presence and dimensions of the vehicle. The other distances given, such as 700 feet, 900 feet, and 1,000 feet, exceed the legal requirements specified for clearance lights, which means they do not align with current regulations. Understanding regulatory distances helps drivers ensure their vehicles are compliant and safe for operation.