A section of a main road route into London had to close today as rush-hour travellers mixed with Olympic traffic on the first working day during the Games.

A serious accident meant the closure of the London-bound section of the M4 between junction 5 at Langley in Berkshire and junction 4b near Heathrow airport in west London.

Long queues built up on the motorway which goes into an Olympic traffic-only Games lane nearer London.

There were also jams for drivers at some of the Games lanes sites in London, including the A40 in west London and the Canning Town Flyover in east London.

But Tube and main line rail services operated well during the morning peak period.

Transport for London (TfL) advised travellers that London Bridge station would be very busy today with spectators travelling to the equestrian cross country event at Greenwich Park in south east London.

A part of London Bridge is being closed to departing passengers from 6pm to 10pm tonight to minimise congestion.

Those affected are passengers travelling on the Kent-bound services run by the First Capital Connect and Southeastern train companies.

TfL said Olympic events meant the Docklands Light Railway would be particularly busy today as would Canary Wharf and Bank Tube stations.

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  • Tarlan Karimov & Musa Mogushkov

    Tarlan Karimov of Azerbaijan (in blue) competes against Musa Mogushkov of Russia during the men's -66kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • Ashleigh Brennan

    Australian gymnast Ashleigh Brennan performs on the floor during the Artistic Gymnastic women's qualifications at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Julie Jacobson)

  • Ronny Turiaf

    France's Ronny Turiaf goes up for a dunk during the first half of a preliminary men's basketball game against the USA at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Eric Gay)

  • Giulia Steingruber

    Swiss gymnast Giulia Steingruber performs on the balance beam during the Artistic Gymnastics women's qualification at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Gregory Bull)

  • Elsa Baquerizo

    Spain's Elsa Baquerizo, left, reacts with teammate Liliana Fernandez after they beat the Netherlands during a beach volleyball match at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Dave Martin)

  • David Florence

    David Florence of Britain competes in the heats of the C-1 men's canoe slalom at Lee Valley Whitewater Center, at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Kirsty Wigglesworth)

  • Netherlands Field Hockey

    The Netherlands Field Hockey team congratulates each other shortly after defeating Belgium 3-0 in the women's hockey preliminary match at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Bullit Marquez)

  • A Mexico fan cheers prior to the men's group B soccer match between Mexico and Gabon at the London 2012 Summer Olympics, in Coventry, England, Sunday, July 29, 2012. (AP Photo/Hussein Malla)

  • Liliana Fernandez

    Spain's Liliana Fernandez sets the ball during a beach volleyball match against the Netherlands at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Dave Martin)

  • Georgia Bonora

    Australian gymnast Georgia Bonora performs on the uneven bars during the artistic gymnastics women's qualifications at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Matt Dunham)

  • Mary Jenkins

    Mary Jenkins of Strabane, Northern Ireland, waits out a rain delay at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Sunday, July 29, 2012. (AP Photo/Mark Humphrey)

  • The peloton passes by The Mall near Buckingham Palace during the women's road cycling race at the 2012 Summer Olympics on Sunday, July 29, 2012, in London. (AP Photo/Charlie Riedel, Pool)

  • Canada's women's rowing team

    Canada's, from left, Lesley Thompson-Willie, Andreanne Morin, Darcy Marquardt, Ashley Brzozowicz, Natalie Mastracci, Lauren Wilkinson, Krista Guloien, Rachelle Viinberg, and Janine Hanson stroke during a women's rowing eight heat in Eton Dorney, near Windsor, England, at the 2012 Summer Olympics, Sunday, July 29, 2012. Canada won the heat. (AP Photo/Natacha Pisarenko)

  • Julia Goerges

    Julia Goerges of Germany reacts after winning the first set against Agnieszka Radwanska of Poland during their match at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Sunday, July 29, 2012. (AP Photo/Elise Amendola)

  • Weili Yu

    Hong Kong's Weili Yu lifts during the women's 53-kg, group B, weightlifting competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London.(AP Photo/Mike Groll)

  • Great Britain's cycling team

    Great Britain's cycling team stand together before the start of the Women's Road Cycling race at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Christophe Ena)

  • Ravil Manafov of Kazakhstan, left, reaches for the ball as Guillermo Molina Rios of Spain defends during their mens Water Polo preliminary round match at the 2012 Summer Olympics, Saturday, July 28, 2012, in London.(AP Photo/Alastair Grant)

  • Rosalba Forciniti of Italy celebrates her win over Kyung-Ok Kim of South Korea during the women's -52kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • United States' Missy Franklin starts in a women's 100-meter backstroke swimming heat at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Sunday, July 29, 2012. (AP Photo/Mark J. Terrill)

  • Moldir Azimbay

    Gymnast Moldir Azimbay from Kazakhstan performs on the uneven bars during the artistic gymnastics women's qualifications at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Julie Jacobson)

  • Olena Kostevych

    Ukraine's Olena Kostevych shoots during the women's 10-meter air pistol final at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. Kostevych finished third to win bronze in the event.(AP Photo/Rebecca Blackwell)

  • The pack of cyclists ride past Buckingham Palace in the rain during the Women's Road Cycling race at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Matt Rourke)

  • Visitors by their tickets for the Olympic Park at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Emilio Morenatti)

  • Raul Neto

    Australia's Patrick Mills celebrates after hitting a 3-point shot and being fouled by Brazil during a men's basketball game at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Charles Krupa)

  • Swimmers start their heat in the men's 100-meter backstroke at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Daniel Ochoa De Olza)

  • Kristyna Palesova

    Czech gymnast Kristyna Palesova performs on the vault during the artistic gymnastics women's qualifications at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Julie Jacobson)

  • Annika Urvikko

    Gymnast Annika Urvikko from Finland performs on the uneven bars at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Julie Jacobson)

  • Jennie Johansson

    Sweden's Jennie Johansson competes in the women's 100-meter breaststroke swimming heat at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Sunday, July 29, 2012. (AP Photo/Matt Slocum)

  • Yun Choi Om

    North Korea's Yun Choi Om lifts during the men's 56-kg, group B, weightlifting competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Hassan Ammar)

  • Bombayla Devi Laishram

    India's Bombayla Devi Laishram shoots during the women's archery team competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Marcio Jose Sanchez)

  • United States' Ricky Berens, top, United States' Ryan Lochte, center, and China's Sun Yang men's 200-meter freestyle swimming heat at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Sunday, July 29, 2012. (AP Photo/David J. Phillip)

  • Clemens Doppler

    Austria's Clemens Doppler dives for the ball during a beach volleyball match against Brazil at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Dave Martin)

  • Muller Dinda & Oribe Peralta

    Gabon's Muller Dinda (2) jumps for the ball against Mexico's Oribe Peralta, bottom, during the group B men's soccer match at the London 2012 Summer Olympics, in Coventry, England, Sunday, July 29, 2012. (AP Photo/Hussein Malla)

  • Tony Parker

    France's Tony Parker argues a call with an official during the first half of a preliminary men's basketball game against the USA at the 2012 Summer Olympics, Friday, July 27, 2012, in London. (AP Photo/Eric Gay)

  • Tang Peng

    Tang Peng of Hong Kong competes against Noshad Alamiyan of Iran during the men's singles table tennis at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Sergei Grits)

  • Kobe Bryant

    USA's Kobe Bryant bites his jersey during the first half of a preliminary men's basketball game against France at the 2012 Summer Olympics, Friday, July 27, 2012, in London. (AP Photo/Charles Krupa)

  • Thomas Edgar, Rodrigo Quiroga

    Australia's Thomas Edgar (19) spikes the ball past Argentina's Rodrigo Quiroga (9) during a men's volleyball preliminary match at the 2012 Summer Olympics Sunday, July 29, 2012, in London. (AP Photo/Chris O'Meara)

  • Gabrielle Douglas

  • Abigail Johnston and Kelci Bryant

    US Silver medalists Abigail Johnston, front, and Kelci Bryant, rear, compete during the 3 Meter Synchronized Springboard final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Sunday, July 29, 2012. (AP Photo/Michael Sohn)

  • Abigail Johnston and Kelci Bryant

    US Silver medalists Abigail Johnston, front, and Kelci Bryant, rear, compete during the 3 Meter Synchronized Springboard final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Sunday, July 29, 2012. (AP Photo/Michael Sohn)

  • Marianne Vos

    Marianne Vos, left, of The Netherlands, celebrates as she crosses the finish line to win the gold medal in the Women's Road Cycling race at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Christophe Ena)

  • Huang Cunguang

    China's Huang Cunguang competes in the men's K-1 kayak slalom heats at the Lee Valley White Water Center at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Victor R. Caivano)

  • Dalibor Doder

    Sweden's Dalibor Doder, left, is tackled by Tunisia's Wissem Hmam, right, during their men's handball preliminary match at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Vadim Ghirda)

  • Liu Qiang and Luke Jackson

    China's Liu Qiang, and Australia's Luke Jackson react after Liu won their men's light 60-kg boxing match at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Patrick Semansky)

  • Lebron James

    USA's Lebron James (6) grabs a rebound during the first half of a preliminary men's basketball game against France at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Eric Gay, pool)

  • Abigail Johnston, Kelci Bryant

    Abigail Johnston and Kelci Bryant of the USA compete during the 3 Meter Synchronized Springboard final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Sunday, July 29, 2012. USA won the silver medal in the event. (AP Photo/Mark J. Terrill)

  • Wu Minxia

    Wu Minxia of China, left, and He Zi compete during the 3 Meter Synchronized Springboard final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Sunday, July 29, 2012. China won the gold medal in the event. (AP Photo/Mark J. Terrill)

  • Jennifer Pinches

    Gymnast Jennifer Pinches from Great Britain performs on the floor during the Artistic Gymnastic women's qualifications at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Julie Jacobson)

  • Tony Parker

    France's Tony Parker is stripped of the basketball by USA's James Harden, right, during the first half of a preliminary men's basketball game at the 2012 Summer Olympics, Friday, July 27, 2012, in London. (AP Photo/Eric Gay)

  • Abigail Johnston and Kelci Bryant

    US Silver medalists Abigail Johnston, left, and Kelci Bryant, right, pose during the medal ceremony for the 3 Meter Synchronized Springboard final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Sunday, July 29, 2012. (AP Photo/Michael Sohn)

  • Yoshiaki Oiwa

    Yoshiaki Oiwa, of Japan, right, is congratulated by Ruy Fonseca, of Brazil, as they pass each other at the exit of the ring after Oiwa took the lead in the equestrian individual eventing dressage phase at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/David Goldman)