Tow trucks permitted to use variable message signs.

HF 3694 allows tow trucks to display portable variable message signs while performing emergency services on or near highways. This directly affects tow truck operators, who can now use these digital signs to communicate messages (like "STOP" or "LANE CLOSED") during emergencies. The bill specifies these signs must follow Minnesota's traffic control device standards and can only be used during emergency responses, not for routine towing. It amends existing law to add this provision without changing current requirements for red and amber warning lights.