Weâ€™ve completed all major concrete repairs and waterproofing on the northbound carriageway. This means we have now moved into the final phase of the project.
Weâ€™ve changed the road layout and removed the contraflow for this final phase. There are two lanes on the northbound and two lanes on the southbound carriageway. This change has allowed us to increase the speed limit from 30 to 40mph along the viaduct. This is a significant step towards completion of the main work in autumn.
Until then, our specialist repair teams will be working in the lanes either side of the central reservation, where they will carry out repairs to damaged concrete and the central barrier.
We recognise the impact this scheme is having on your journeys and appreciate your frustration that work is still ongoing. The traffic management at M6 Junction 8 southbound and the 50mph speed limit on the approaches to the roadworks will remain in place until autumn 2019.
The final phase of work will include:
- removing the temporary surface in the outer lane of the southbound carriageway
- limited concrete repairs in the outer lane of each carriageway and along the central reservation
- upgrading 1km of central barrier to the more modern concrete type
- waterproofing and resurfacing the outer lane of each carriageway
- installing three new gantries and refurbishing the three currently in place
- ongoing upgrades to the drainage underneath the central reservation
- ongoing removal of a large amount of scaffolding underneath the structure
Once we complete the main work, weâ€™ll only need overnight closures to complete the work to the gantries.
|January 2017||Enabling work started|
|March 2017||Public information events held|
|April 2017||Three narrow lanes installed between junctions 1 and 2 with 40mph speed limit on the viaduct|
|August 2017||Contraflow system installed and start of concrete repair works|
|September 2018||Work switches from the southbound to the northbound carriageway|
|January 2019||Removal of traffic management at M5 junction 4a|
|Summer 2019||Removal of contraflow and change to two narrow lanes on each carriageway along the viaduct|
|Autumn 2019||Completion of main work, return to three lanes on each carriageway along the viaduct and remove other traffic management measures|
Why we need this scheme
The M5 is one of the busiest routes in the country, carrying a mix of traffic through the Midlands and onwards to routes in the north and south. This section of the M5 is particularly busy, with traffic joining with the M6 and other roads into and out of the Birmingham hub.
Oldbury viaduct carries approximately 1.8 miles of the elevated sections of the M5 to the west of Birmingham between junctions 1 and 2. The structure is safe, but we need to carry out essential repair work to deteriorated concrete due to its perished waterproofing.
The decision to repair this section of motorway now was based on both its condition and to avoid large-scale projects occurring at the same time around the â€˜Birmingham Boxâ€™ (M5/M42/M6) over the next few years. We have kept the slip roads open and have restricted the occasional closure of slip roads, carriageway and local roads to the night-time only. We have kept open most of the public walkways underneath.
This work is part of the governmentâ€™s long-term Road Investment Strategy to build a modern and resilient road network. By maintaining this key corridor, we will support economic growth locally and across the West Midlands.
The scheme in detail
The scheme is a very significant infrastructure project for the West Midlands, and is the largest concrete repair project in the UK for many years.
The viaduct is 1.8 miles long and was constructed in the late 1960â€™s. It is part of what was known as the Midland Links Motorway. It passes over the conurbation of Sandwell and its usage has grown to 60,000 vehicles per day in each direction. It has several interfaces with local roads, canals and railway and tram lines.
The viaduct is split into 165 separate sections which are linked by joints fitted in the gap between the ends of two sections. On the top of each section is a concrete slab, or deck, which is reinforced by meshes of steel embedded within. The deck has a long maintenance cycle compared to its supporting structures which are in good condition. A waterproofing layer protects a deck from the motorwayâ€™s run-off water, but this layer has perished over time, resulting in damage to the concrete and some corrosion of its steel reinforcement.
We have kept the programme to a minimum by repairing a whole carriageway at a time, starting with the southbound carriageway. This approach separates the workforce from live traffic and provides us with operational flexibility. Other approaches would increase timescales and the disruption to our customers overall. The work is complicated and needs a great deal of planning and safety considerations.
If you're travelling across the country or into and around Birmingham, we encourage you to consider alternative routes on our network, such as the M42 and M6 or M6 Toll. This will reduce the amount of traffic heading through the roadworks in this busy part of the network and will reduce the impact on local roads.
To help with this, we've made changes to the road layout at key junctions in the area, including at M6 junction 8 southbound and M5 junction 4a northbound.
These roadworks are causing some disruption to the M5 and the local area. We would like to thank you for your patience and recommend that where possible you:
- plan ahead
- allow extra time for your journeys
- consider using alternative routes
- change modes of transport
- car share
- work from home
View information on local public transport alternatives.
View information on other work in the Birmingham area.
View information on the M6 Toll.
We regularly review network performance, resilience and recovery. Based on this, we altered our traffic management strategy and reinstated two lanes northbound at M5 junction 4a in January 2019. More recently, we shortened the distance of the 50mph speed restriction on the northbound approach to M5 junction 2 by over a mile. Monitoring continues to show that the restriction at M6 junction 8 is effective.
The different measures in place combine to manage traffic flows safely and minimise the disruption on the M5 corridor, as well as local roads, towns and villages.
Project media files and documents
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