Olympic organisers say no Dorset roads will be closed during the Games
There will be no road closures on the route from London to Portland for the 2012 Olympic Games, the Olympic Delivery Authority has said.
This means Olympic vehicles will share the route with general traffic.
But organisers say these will be 'relatively limited'.
Hugh Summer, the Director of Transport for the Olympic Delivery Authority, said: "The issue is about getting athletes where they need to be, on time."
"The majority of the athletes will be staying [on Portland, therefore limiting the amount of traffic on the route down]."
Some local people had expressed concerned about the increase in the traffic on the county's roads in the days ahead of the 2012 sailing events, at the Weymouth and Portland National Sailing Academy.
Olympic organisers, athletes and media heading to Portland for the 2012 sailing events will share the M3, A31 and A354 with general traffic.
Large stretches of the A31 are single lanes and the route is already prone to heavy traffic and congestion.
The A354, which runs between Weymouth to Portland, is also a busy stretch of road and the main route onto Portland.
The Weymouth Relief Road under construction
An Olympic Route Network plan, detailing special road closures to allow Olympic traffic priority over general traffic and the exclusive use of reserved lanes, is only expected to apply to roads in London, when the plans are announced in January 2010.
Hugh Summer said: "We have specific plans, such as the use of VIP lanes, but we are unlikely to use these lanes on the route down to Weymouth and Portland.
"But [in Dorset] there may be a few changes, such as with traffic lights [to give priority to the route], restrictions on right or left hand turns, and there will be no people digging up the roads [during the Olympics]."
There will also be parking restrictions in and around the Sailing Academy itself, with Olympic vehicles getting parking priority at race times.
The traffic arm of the Olympic's planning authority is recommending all spectators coming to watch the sailing events use public transport, including park and ride schemes.
He said: "Train services to Weymouth will be boosted; there will be extra coach services from the West Country.
WPNSA sailors at Durdle Door mark 1,000 days to 2012 Olympic games
"And we are investing in walking and cycling routes so local people can get to some of the best viewing points by foot or bike.
"People can pedal to the cliffs and hopefully watch Great Britain win lots of gold medals!"
In the run up to the London 2012 Olympic and Paralympic Games, there are also two 'test events', in 2010 and in 2011, which will act as a rehearsal for the traffic planning.
Hugh said: "We've been researching the roads since London got the games and we are confident that we have made all the right decisions."
Weymouth Transport Package
Meanwhile, Dorset County Council is working on a Weymouth Transport Package to improve public transport in the town for the 2012 Games and beyond.
It is hoped the £18m proposals, including more buses and an improved rail/bus interchange, will provide a lasting legacy for the area's public transport long after the Olympic sailing events at Portland.
The Department of Transport is currently assessing the plans with construction scheduled to begin in spring 2010.
Dorset For You: Weymouth Transport Package for the 2012 Games