The first Olympic event, women's football, kicks off in Cardiff on Wednesday as 30 miles of games lanes open across London.
Team GB women's football side are to take on New Zealand in Cardiff's millenium stadium, marking the start of the 18-day sporting spectacular.
However the potential for olympic travel chaos is building in the wake of the controversial games lanes. Additionally the government continues to battle against planned border staff strikes expected tomorrow, which could cause queues and chaos at Heathrow airport.
The Home Office is to seek a high court injunction, claiming there are "procedural errors" in the ballot by members of the PCS union and any action would be illegal.
"We want the PCS leadership to call off this irresponsible strike and we continue to ask members not to walk out at a time when the eyes of the world are on the UK." A Home office spokesman said yesterday.
With with the games lanes in force from 6am, 1,300 vehicles an hour are expected to use them. Any "ordinary" motorists going into the games lanes face fines of £130, while release fees for impounded vehicles could be £200.
Games lanes have caused confusion and chaos in recent weeks. Many motorists are angry their vehicles aren't included in the list allowed to use the lanes
Buses and taxis will not be allowed in most games lanes while the extra routes will also be out of bounds to disabled drivers who are Blue Badge holders.
The games lanes run alongside will only be used by authorised "Olympic Family" vehicles. These include vehicles used by athletes, Olympic officials and VIPs.
During the period of the lanes being operational, some turns have been banned, some bus lanes suspended, some bus and coach stops have been adjusted and some pedestrian crossings will not be operational.
There were taxi protests against exclusion from the lanes on Monday, causing heavy traffic around the Tower Bridge area.
Most lanes will stay in place from 6am to midnight on each day up to Tuesday August 14 and will form part of a 109-mile Olympic Route Network (ORN) around London.
In addition to central London, there will be road restrictions around the sailing venues at Weymouth and Portland in Dorset, around the rowing at Eton Dorney in Berkshire and around the mountain biking venue at Hadleigh Farm in Essex.
Also, some roads will be closed for the men's and women's Marathons and the biking events.
Games lanes will generally be on the off-side (outside) lane. Cyclists will be able to use the near-side (kerbside) games lanes but not the off-side ones, while motorcyclists will be able to use some of the near-side lanes.
Transport for London (TfL) is urging drivers to avoid London from now until the end of the Games.
Those using public transport are being told to expect stations close to the Olympic Torch route to be very busy. The Torch is passing through every London borough and those wishing to see it are being asked to view it as close to possible to home or work.
London mayor Boris Johnson said: "With just days until the opening ceremony, London is more prepared for the Games than any other Olympic city has ever been. The ORN is a requirement of all host cities, ensuring athletes and officials get to their events on time.
"We will also operate the games lanes flexibly so that if demand from the official Olympic vehicles is low, we will open up the games lanes to all traffic."
Despite fears over the ability of London's infrascruture to cope with olympic traffic, in Cardiff Welsh Secretary Cheryl Gillan said she was "immensely proud that the world's greatest sporting event starts in Wales."
Culture Secretary Jeremy Hunt will join Gillan in the Welsh capital for the first sporting event of London 2012.
Every very goal scored by Britain's men's and women's football teams in the Olympic group stages will see 50 footballs donated to charity.
Wembley Stadium, a venue for both the London 2012 and London 1948 Games, is making the gesture as part of the Football Association's Olympic legacy plans.