Balfour Beatty is to upgrade a 13.4 mile stretch of the M3 through Hampshire and Surrey to a 'smart motorway' for the Highways Agency.
The £129m project will increase capacity, reduce congestion and shorten journey times for motorists.
The M3 between Junction 2 (interchange with the M25) and Junction 4a (Fleet) will be upgraded to a four-lane motorway by converting the hard shoulder to a permanent running lane. Electronic signs will be installed to manage the flow of traffic in response to driving conditions.
Mobilisation work is due to start at the beginning of August. The main construction work is due to start this autumn with completion scheduled for spring 2017. Construction activity will include installing and refurbishing gantries, new static and variable signs, concrete safety barriers, drainage and surfacing works.
(CD/JP)
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