Progress on the M3 junction 9 to 14 smart motorway continues with the detailed design of the scheme underway.
A number of surveys will be taking place over the coming months to inform the design work. These surveys will be looking at a range of aspects including drainage, environmental factors and motorway asset condition.
The first to be undertaken will be a drainage survey between junctions 9 and 14. This work began in December 2018 and will finish in Summer 2019. To minimise the impact on local communities and businesses, the majority of the surveys will take place on weeknights.
For work to be progressed safely and quickly, it will be necessary to implement some temporary traffic restrictions. These temporary traffic restrictions will involve lane closures and limited slip-road closures. Where a slip-road is closed, a diversion will be put in place.
Please note that we will complete this work overnight. The motorway will be kept open throughout the day during the periods of the traffic works.
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Why we need this scheme
The M3 is located in Hampshire, and falls within our Area 3 Asset Support Contract, as well as the South East Regional Control Centre. It's a key part of the strategic road network, providing a vital transport link to London, south Hampshire via the M27 Southampton interchange, and the Midlands via the A34.
The M3 junctions 9 to 14 is a crucial route connection for the Solent to Midlands, and Solent to M25 routes. The A34 is linked to the M27 by the M3 junction 14 at Eastleigh to junction 9 at Winchester. The route serves the ports of Southampton and Portsmouth, Southampton Airport, and the wider Solent region.
This route is heavily used by cars and freight, and faces congestion during peak travel hours caused by the volume of traffic using the network.
The aims of this scheme are to:
- reduce congestion and smooth the flow of traffic by turning the hard shoulder into a permanent running lane
- improve journey time reliability on the strategic road network
- support the economy and facilitate economic growth by providing increased capacity on the motorway
- continue to deliver a high level of safety performance on the network using smart motorway techniques
- minimise environmental impacts of the scheme and where possible allow for enhancements to be made to the environment
The scheme in detail
The M3 smart motorway stretches from junction 9 (Winchester / A34 interchange) to junction 14 (M27 Southampton interchange). The scheme is 13km (8 miles) long.
The scheme includes:
- junction 9 to 13 upgraded to a smart motorway with all-lane running
- junction 13 to 14 to a controlled motorway
- junction 14 to M27 link road to a controlled motorway
The scheme will involve:
- new CCTV cameras and electronic information signs and signals on gantries - these will show variable mandatory speed limits and manage traffic flow and incidents
- emergency areas throughout the length of the scheme
- a safe area located on junction 11 and 12 slip roads
- the hardening of the central reserve and installation of a reinforced barrier to improve safety
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