NARROW lanes are set to be installed on the M275 from next week.
Lanes will be narrowed and a contraflow system will be set up as Portsmouth City Council’s £28m Tipner revamp continues.
The changes will see lane three of the southbound carriageway cross over to the northbound carriageway.
Drivers in the contraflow lane will not be able to exit the M275 at Rudmore roundabout and anyone wishing to leave the motorway there should keep to the left-hand lane.
The 40mph speed limit will remain in place throughout.
Work will be carried out at night to minimise disruption.
Officials said the temporary layout is being brought in to allow contractors to work safely on the motorway without lanes being closed. It will remain in place until spring next year.
Graham Baggaley, project manager, said: ‘Introducing the narrow lanes and contraflow means we can keep three lanes of traffic flowing in and out of Portsmouth and avoid unnecessary congestion.
‘It may seem alien at first but everything will be clearly signed in advance and we’re very grateful for drivers’ patience and co-operation during this work.’