Under what circumstances is backing up allowed on freeways or expressways?

Back up on freeways or expressways is generally prohibited due to the high-speed nature of these roads and the increased danger involved. Emergency vehicles are the exception to this rule. They may need to back up quickly in response to accidents or emergencies where it is necessary to reach a scene or clear the road.

The design of freeways is such that drivers expect continuous, high-speed travel without interruptions. Therefore, backing up is not just dangerous; it also disrupts the flow of traffic and can lead to serious accidents. While law enforcement might instruct certain maneuvers for traffic management or safety, backing up is typically dangerous and should be avoided by all other vehicles except those responding to emergencies.

This understanding reinforces safe driving practices on high-speed roads and the importance of following regulations designed to protect all road users.