This road project has now been completed. This page will be available for 6 months from the date of scheme completion, after which time you will only be able to access this information on The National Archive version of this page.

M3 Junction 6 Black Dam Roundabout Improvements

Project status:   Completed


Start date:   October 2014
End date:  11 March 2016


Type:   Improvement Scheme
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Improvement Scheme

Part of our programme of improvements (generally with value <£10m)

Cost:  £11.246 million


Managed by:   Area 3

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Where was the project located?

The Black Dam Roundabout is located at the northern end of the M3 Junction 6 Spur in Basingstoke, Hampshire.

Why was the scheme needed?

The Black Dam roundabout was operating above capacity, resulting in long queues during weekday peak periods along all approach roads and even onto the M3 Junction 6 exit slip roads.

As part of the Government's Pinch Point Programme it was decided to increase the capacity of the junction to improve safety and traffic flows at this location.

What work was carried out?

Work included:

  • construction of a four lane northbound carriageway through the roundabout •widening on the eastern side of the gyratory to provide four lanes •widening on the north-eastern section of the gyratory to provide five lanes
  • M3 spur road: widening to provide three lanes southbound from Black Dam roundabout to the M3 junction 6 roundabout
  • A339 southbound: widening to provide four lanes approaching the roundabout
  • A339 northbound: widening into the central reserve to provide four lanes to the A3010 Churchill Way diverge
  • A30 ringway south: widening to provide three lanes on approach to/from the roundabout •provision of two lanes onto the A339 northbound carriageway
  • A30 London Road: widening to provide two lanes to the roundabout and two lanes to the four-lane northbound carriageway through the roundabout •widening to provide two lanes off the exit from the roundabout •installation of a refuge island for cyclists and pedestrians on the A30 opposite Redbridge Lane

Associated works will include:

  • realigning all approaches to the roundabout
  • installing new traffic signals
  • installing new streetlighting
  • installing new traffic signs to advise motorists of the revised layout
  • renewal of road markings

How did this benefit road users?

Following completion of the scheme, traffic flows and journey times around the junction have improved.

How do I find out more information ?

If you have any queries about this project you should contact the Highways Agency Information Line by emailing ha_​info@​highways.​gsi.​gov.​uk or calling 0300 123 5000.

For other works planned for Basingstoke please visit: http://​www​.basingstoke​.gov​.uk/​b​r​o​w​s​e​/​t​r​a​n​s​p​o​r​t​-​a​n​d​-​s​t​r​e​e​t​s​/​h​i​g​h​w​a​y​-​w​o​r​k​s​.​htm

Please note that due to an ongoing technical error, the Highways Agency Information Line is still displaying the old email address and we are hoping to resolve this problem as soon as possible. In the meantime the old email ha_​info@​highways.​gsi.​gov.​uk is still working and you can also use our new email address info@​highwaysengland.​co.​uk.

Details of scheduled roadworks are provided to help you plan your journey. Please note that works are weather- and resource- dependent and may need to be cancelled at short notice. This information is not updated in real time so please check Traffic England for current traffic conditions. Diversion timings are approximate and act as a guide only.

How will you manage traffic?

 

 

 

Leaflet

How to use the M3 Junction 6 Black Dam Roundabout
How to navigate the roundabout - flyer

Other

M3 Junction 6 Black Dam Junction Improvement Frequently Asked Questions
M3 Junction 6 Black Dam Junction Improvement Frequently Asked Questions
Black Dam Improvements M3 Junction 6 - Exhibition imagery
The Black Dam Roundabout is a vital junction to and from Basingstoke.
Black Dam Improvements Exhibition Panels
Black Dam improvements M3 Junction 6 - Exhibition Panels

Plan

Report

M3 Junction 6 Black Dam Roundabout Improvements - Environmental Covering Note
Summary note describing environmental assessments required for this scheme.
M3 Junction 6 Black Dam Roundabout Improvements - Surface Water Drainage
Summary of results from surface water drainage investigation carried out as part of scheme design.
M3 Junction 6 Black Dam Roundabout Improvements - Summary of Environmental Results
Summary of results following investigation of environmental aspects affected by this scheme including air quality, visual impact and wildlife.