Under clear atmospheric conditions, how far must taillights and stop lights be visible?

Taillights and stop lights must be visible from a distance of 500 feet under clear atmospheric conditions. This visibility requirement is crucial for ensuring that other drivers are aware of your vehicle's intentions, particularly during situations such as stopping or slowing down. Visibility from this distance helps prevent accidents by providing sufficient warning to drivers behind you, allowing them to react appropriately. The standard is designed to enhance road safety, as it gives ample time for other motorists to perceive the lights and respond accordingly.