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
Watch out for some dense fog patches tonight. Tomorrow will be cloudy and breezy but it'll be warmer than of late.
Watch out for some dense fog tonight. Tomorrow will be cloudy and breezy but milder.
The director of the yachting management firm for the Cheeki Rafiki has entered a plea of not guilty to the manslaughter of the yacht's crew