Dorset Police have said drivers are causing considerable problems by ignoring diversion signs and trying to find their own alternative routes.
Back roads through small villages - particularly around the A35 road closure - are causing motorists problems. These smaller roads are either flooded, covered in flood debris or too narrow to cope with the increased volume of traffic.
Diversion routes have been carefully devised to provide the safest and most appropriate alternative routes for all road users, and ignoring the diversions will cause further delay and disruption.
Police advise that roads will be re-opened as soon as they are safe and passable.
More top news
She may not look like she's had a near-death experience but Aunt Bessie is "Staying Alive" thanks to that song by the Bee Gees.
Residents living near the Somerset Levels are positive the dredging of 150,000 cubic metres will prevent any serious flooding
A woman has been charged over an alleged scam, in which it's claimed people lost money on holidays in Rhyl and Devon that didn't exist.