M40/M42 interchange: smart motorway

The M40/M42 interchange is frequently congested at peak times, affecting both local journeys and long distance traffic between London and Scotland. Major new developments in Birmingham, Solihull and the Black Country will also increase demand on the junction.

Start date Started

End date 2023-24

Cost £133 million - £312 million

Latest updates

13 January 2021
Ongoing survey work

Since November 2020, we’ve been carrying out a number of different surveys on both carriageways between M42 junction 3 and 3a. On the 18 January, we’ll be moving onto the section between the M42 junction 3a and M40 junction 16. We’ll need overnight lane closures from 9pm and 6am to carry out the surveys safely.

We’ll also need close the following slip roads overnight from 9pm and 6am:
- M42 northbound to M42 northbound link at junction 3a - 5, 6, 7, 8 and 11 January 2021
- M42 southbound to M42 southbound link at junction 3a - 12, 13, 14,15 and 18 January 2021
- M40 northbound to M42 northbound link at junction 3a - 15, 16, 17, 18,19, 20 and 21 February 2021
- M42 southbound to M40 southbound link at junction 3a - 22, 23, 24, 25 and 26 February 2021
- M40 J16 northbound entry slip road - 17 and 18 February 2021 and 3, 4 and 5 March 2021.
- M40 J16 southbound exit slip road closed – 1, 2, 3, 4 and 5 February 2021.
Please note that these dates may be subject to change
27 October 2020

Survey work

Over the next few months, we’ll carry out a number of different surveys. We’ll also need to carry out vegetation clearance in some isolated places to help us access the areas safely while we carry out the surveys. We’ll be working hard to keep any disruption to a minimum, but you may hear noise from the vegetation clearance or drilling if you live close by.

To carry out the surveys safely, we’ll need to close some lanes overnight from Monday to Saturday between 9pm and 6am. We will keep one lane open. We’ll carry out a ‘traffic count’ before we close the lanes and if traffic levels are too high, we will delay the work until traffic levels are suitable. If you’re travelling through the area, please allow extra time for your journeys

During January and February 2021, we’ll need some overnight closures of the M42 junction 3a link roads in. During these closures, we’ll divert road users to the next junction to return straight back to continue their journey.
21 August 2020

Scheme to be delivered by 2023-24

As we deliver this important road upgrade, we are conscious of the need to keep the region moving. We will coordinate our work with HS2 and the Commonwealth Games to minimise disruption to the network and we are currently finalising our work programme on this basis. We will deliver the scheme by 2023-24, but now expect to start the main construction work slightly later than originally planned.
23 January 2020

Variable mandatory speed limit consultation

Over the last year we have gathered information about the road and the areas that surround it to develop the design for the M40/M42 Interchange smart motorway project and determine which operating system to use.

We have launched our consultation to seek views on the proposed regulations to introduce variable mandatory speed limits to the M40 / M42 Interchange, including slip roads, between M42 J3 and J4 and M40 J16 as part of the M40 / M42 Interchange Smart Motorway Scheme.

Your opinion is important to us. We would like to encourage you to have your say on the proposals and would specifically like to hear how the proposal could affect you, your organisation or those you represent.

The consultation is now open for you to give us your views and will last for 4 weeks from 23 January 2020. It will close on 20 February 2020; please ensure responses arrive no later than the closing date.

Following the consultation period, we will produce a report which will provide a summary of the responses, the decision whether to proceed or to modify the proposals and allow us to respond to any comments made.

See more updates

Project information

Over the last year, we have been gathering information about the road and the areas that surround it to develop the design for the M40/M42 Interchange smart motorway project.

Our proposed regulations include the introduction of variable mandatory speed limits to the M40 / M42 Interchange, including slip roads, between M42 J3 and J4 and M40 J16 as part of the M40 / M42 Interchange Smart Motorway Scheme.

Following the consultation period, we will produce a report which will provide a summary of the responses, the decision whether to proceed or to modify the proposals and allow us to respond to any comments made.

The M40/M42 interchange is very important for local traffic and forms an important link for long distance traffic travelling between London and Scotland.

Congestion already occurs frequently at peak times at the interchange.

This scheme aims to: