What type of lights must be used on the rear of an overwidth load at night?

When transporting an overwidth load at night, the use of red lights or red reflectors is essential for safety and visibility. These red markers help to alert other drivers on the road about the presence of a wider vehicle, enhancing the overall safety of nighttime road operations. Red is the universally recognized color for caution, particularly in the context of motor vehicles.

Red lights or reflectors are specifically required because they are visible from a distance, allowing approaching traffic to react appropriately. In addition to improving visibility, these lighting requirements aim to prevent accidents by clearly defining the dimensions and boundaries of the oversized load, which could otherwise pose a risk to motorists who may not be aware of the vehicle’s extended width.

In contrast, blue, white, or green lights do not fulfill this regulatory requirement, as they are not designated for use in specifying the rear extent of an overwidth load, and could potentially cause confusion among drivers about the vehicle's status or intentions.