Police, the Highways Agency and local councils are today warning of chaos on the roads around the Olympics.
With cycling and rowing near the M25 drivers, are being warned to expect long delays.
Despite substantial investment in the roads to Weymouth, the Highways Agency says visitors should also allow for plenty of time to get to the sailing events.
More top news
Wednesday night's weather for the east of the region
Wednesday night's weather for the west of the region
Simon's Blog - Things That Look Like Other Things