WP53 ZTL is a Mitsubishi Shogun operated by The Highways Agency. Although not an emergency vehicle, it is used to patrol major roads. The crew do not have the same rights as traffic police, but are able to direct traffic in the event of an incident.
From this view you can see how the livery differs from an emergency vehicle. We have yellow and black battenburg markings and orange and red flashing lights on the roof bar.