Thousands of people are expected to line the Surrey roads as Bradley Wiggins and Mark Cavendish attempt to repeat their Tour de France success.

Wiggins will be part of the GB road-race squad working to get Cavendish the gold on Saturday, and will be racing for his fourth Olympic gold in the time trials on Wednesday.

Helyn Clack, Surrey County Council’s cabinet member for the 2012 Games, said: "Mark Cavendish could win Team GB’s first gold medal this weekend and just a few days later Bradley Wiggins is tipped to win the time trial, both on Surrey’s roads, so we’re expecting huge crowds.

"We’re urging people to be prepared and plan ahead.  

"We have to create the biggest venues of the Games from scratch and 42 miles of roadside barriers have already started to be stacked around the road race route.

"There’ll be road closures and parking restrictions along the route on event days, so we’re asking people to avoid driving if possible."

The men's race will take place on Saturday and the women's on Sunday, both starting at The Mall in London. 

On Saturday, the men's road-race is expected to arrive in Dorking at 11.35am, and the women's race at 1.55pm on Sunday. 

After nine laps of Box Hill on Saturday for the men, and two laps on Sunday for the women, the competitors will make for Leatherhead passing the Red House Gardens in Leatherhead at about 2.50pm on both days.

For full details and on-the-spot coverage of the races go to epsomguardian.co.uk/olympics