Highways England has announced plans to commence overnight works along the M27, A27 and A3(M), starting on Tuesday, April 6.
The measures being undertaken are in the interests of road safety, says the agency.
Traffic affected by the road closures will be diverted along different routes, with signage in place to keep disruption to a minimum.
Here are all the routes being worked on:
:: The eastbound carriageway of the M27 and A27 between junction 11 and the Langstone Interchange
:: The westbound carriageway of the A27 and M27 between the Broad Marsh Interchange and junction 11
:: The westbound carriageway of the A27 between the Warblington Interchange and the Langstone Interchange
:: The southbound carriageway of the A3(M) between junction 3 and the Broad Marsh Interchange
:: The roads leading from the eastbound carriageway of the A27 at the Langstone Interchange, the Warblington Interchange and the Farlington Interchange
Overnight closures mean the traffic restrictions will be in effect from 9pm and 6am each day.
Meanwhile, Portsmouth City Council is closing the footpath along the coastal promenade in Hilsea down to Twyford Avenue, Stamshaw, as repair works are carried out on the concrete wall.
This closure will also run from April 6, and is due to last four weeks.
The information in this story came from a public notice published in this newspaper. You can read more public notices in our classified section today.