Motorists are being urged to plan ahead as a series of overnight, weekend, and long-term closures are introduced for the M3 Junction 9 improvement scheme near Winchester.
In a Facebook update, leader of Hampshire County Council, Cllr Nick Adams-King, stressed the scheme is being delivered by National Highways but will have a significant impact on local routes.
He said: "These are National Highways works, not Hampshire County Council works, but I know they will affect many Hampshire residents and those travelling around Winchester, the M3, A34, A33, and surrounding roads."
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Overnight closures include:
Monday 6 July to Thursday 30 July (weeknights): M3 northbound closed between junctions 10 and 9, 8pm to 6am, for carriageway management works.
Monday 20 to Saturday 25 July, and Tuesday 4 to Saturday 8 August: sections of the M3 junction 9 roundabout closed between the A34 northbound and southbound, 8pm to 6am, for traffic management layout changes.
Thursday 30 July: M3 southbound closed between junctions 8 and 9, 8pm to 6am, for temporary vehicle restraint removal.
A major long-term closure will see the M3 junction 9 northbound entry slip road shut from 9pm on Friday 31 July 2026 until winter 2027, with no access to the M3 northbound from the roundabout.
Cllr Adams-King added: "Please plan ahead, allow extra time, and where National Highways advise it, switch off your satnav and follow the signed diversion routes."
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