Broken down car towing caravan causes A31 delays Broken down car towing caravan causes A31 delays. File picture. email (7) comments print First published in News Last updated A BROKEN-down car towing a caravan is causing hold-ups on the A31 this afternoon. The vehicle has come to a halt on the Lake Gates roundabout, at the B3078 Wimborne Road. Traffic is slow on all approaches as a result.