Drivers are being reminded that overnight closures on the M3 begin tonight as work continues on the junction nine improvement scheme.
The northbound carriageway between junctions ten and nine will be closed from 8pm to 6am on weeknights between 6 July and 30 July.
Weekend closures are not currently planned.
National Highways said the closures are needed to carry out carriageway-management work as part of the major upgrade near Winchester.
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Motorists travelling north from the Winchester area are being warned to expect delays and increased traffic on surrounding routes, including the A31, A272, A34 and roads approaching junction nine.
Drivers are advised to allow extra time for their journeys, follow the official signed diversion route and avoid relying on satnav, which could direct traffic onto unsuitable local roads.
National Highways said the overnight closures could change at short notice because of weather conditions or other operational issues.
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