Dramatic action is needed to reduce congestion on the capital's roads, according to a report from the London Assembly.
The report suggests various reforms including altering the congestion charge and restricting deliveries.
Some four million people from the UK are expected to travel abroad during the Christmas and new year period, according to a travel organisation.
The Association of British Travel Agents is predicting December 18, December 23 and December 30 will be the busiest travel dates.
Many airports are expecting an increase in passenger numbers from December 18 to January 2 compared to last year, with 900,000 departing from Gatwick and 500,000 from Stansted Some 600,000 will fly out of Heathrow between December 19-25.
Labour London Assembly Member Val Shawcross has raised concerns about Boris Johnson's 'Better Junctions' programme after her requests for an update on the project were ignored by the Mayor's office.
The programme was set up to assess 500 of the worst junctions in the capital, but that number was cut to 33. Ms Shawcross now fears that the number could be scaled back further due to the lack of information on the project.
She said: "It is staggering that Boris Johnson has adopted such a secretive, snail-pace approach to this problem, especially given the cyclists killed and injured which prompted this review. As we head into winter and road conditions become more dangerous for cyclists people will want to know what is taking the Mayor so long."
The collision happened at 6:35 this morning. Neighbours said they heard a loud bang and thought a lorry had crashed into the bridge. When they walked out onto the street they saw a 4 car pile up. They said they tried to help a young woman and a man who were trapped in their vehicles.
A man has sustained life-threatening injuries following a 4 car collision on St Mildred's Road at the junction with Baring Road SE12 this morning.
London Ambulance Service and the Air Ambulance attended the crash to help the injured. One man is suffering from life-threatening injuries following the collision.
Road closures remain in place, and motorists are being urged to avoid the South Circular Road between Grove Park and Catford. No arrests have been made at this stage.
On the roads there is very slow traffic between J3 A312 (Heston) and J1 A4 at the Chiswick Roundabout.There are also long delays on the A3 at West Hill at Lebanon Road in both directions.