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
Police have released CCTV images as part of an appeal for information following a burglary at a WH Smith store in Somerset.
Police are seeking witnesses following two incidents in Devon where concrete breezeblocks were thrown onto moving vehicles below.
Avon and Somerset Police have released a set of photos showing the damage that has been caused to a number of vehicles by arson attacks.