What is the requirement for a high mount stop light in multipurpose passenger vehicles, trucks, and buses with an overall width?

High mount stop lights, also known as third brake lights, are critical for enhancing visibility when a vehicle is stopping. In the context of multipurpose passenger vehicles, trucks, and buses, the specific requirement for the installation of a high mount stop light is determined by the overall width of the vehicle. For vehicles with an overall width less than 80 inches, having a high mount stop light is mandated.

This requirement is rooted in safety regulations that aim to ensure that all vehicles, particularly those larger in size, maintain high visibility, especially during braking situations. As the width of the vehicle can affect the driver's perspective and the visibility of brake lights to following drivers, the specification for fitting a high mount stop light at this width is essential to reduce the risk of rear-end collisions due to a lack of visibility.