A turn signal lamp must be visible in normal sunlight from a distance of at least how many feet if the vehicle is at least 80 inches wide?

A turn signal lamp on a vehicle that is at least 80 inches wide must be visible in normal sunlight from a distance of at least 500 feet. This requirement is put in place to ensure that other road users can clearly see the turn signals from a significant distance, promoting safety on the road. The visibility standard accounts for larger vehicles, which require a longer distance for visibility due to their size. A distance of 500 feet ensures that other drivers have enough time to react to the signal, helping to prevent accidents and facilitating smoother traffic flow. This visibility standard is crucial for maintaining safe driving conditions and ensuring effective communication between drivers on the road.