Tow trucks permission to use variable message signs

This bill permits tow trucks in Minnesota to display portable variable message signs while performing emergency services on or near highways. It directly affects tow truck operators by allowing them to use these signs (e.g., to display warnings like "STOP" or "ACCIDENT AHEAD") during emergency responses, as long as the signs meet Minnesota's traffic control device standards. The key provision amends traffic regulations to explicitly authorize this use during emergency service, supplementing existing requirements for flashing red and amber lights. The bill does not change general towing operations but adds a safety tool for emergency scenarios. It is a procedural change to traffic equipment rules, not a broad policy shift.