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
Philippa has Monday's weather for the east
Philippa has Monday's weather for the west
The airline says it aims to resume most UK flights today - but experts warn it could take days for services to return to normal.