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.
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Tuesday's late weather for the west of the region
Tuesday's late weather for the east of the region
Tuesday evening's weather for the west of the region