About M40 Traffic
M40 Traffic is a free, independent website dedicated to the M40 motorway — bringing together the latest M40 traffic news, reports, roadworks and delays in one clear, easy-to-use place. It’s part of our Traffic News England network, a family of road-specific sites that help drivers check their route before they set off.
Helping M40 drivers
The M40 runs for 89 miles from Denham, on the edge of London, to Junction 3A of the M42 south of Birmingham. On the way it passes High Wycombe, climbs through the Stokenchurch Gap in the Chiltern Hills, skirts Oxford and runs on past Bicester, Banbury, Warwick and Leamington Spa. It is the main alternative to the M1 between London and the West Midlands, so it pays to check the latest M40 traffic news before you set off.
Other motorways
The M40 meets the M25 at its Junction 1A and ends at the M42, which links on to the M5, the M6 and the A42 for the M1. Our sister sites cover those roads in the same format: M25 Traffic, M42 Traffic, M5 Traffic, M40 Traffic and M1 Traffic. For other roads in England, see Traffic News England.
Find the latest M40 traffic reports
You can find all the latest M40 traffic reports quickly and easily on our Latest M40 Traffic News page — with dedicated Roadworks and Accidents pages too.
Who Publishes M40 Traffic
M40 Traffic is published by Corporate Ace Limited, a company registered in England and Wales.
- Company number: 04435502
- Registered office: 24 St. Marys Way, Burghfield Common, Reading, England, RG7 3YR
- VAT number: GB863826885
- Registered with the Information Commissioner’s Office: Z1734656
- Email:
Where Our Data Comes From
Live traffic information on this site is powered by National Highways’ Transport Data Feeds. Traffic counts come from the Department for Transport’s road traffic statistics for 2025, published 20 May 2026. How we present and explain those figures is our own work.
Contains public sector information licensed under the Open Government Licence v3.0.