DRIVERS could face delays due to overnight closures of the main motorway into Portsmouth during works.
The M275 was to shut north of Rudmore roundabout later today to make way for a gantry to be installed north of Tipner Lake bridge.
Portsmouth City Council said the northbound carriageway would not shut before 10pm because of ferry arrival times.
However the southbound carriageway could shut from 8.30pm.
The motorway was due to be fully reopened by 5.30am tomorrow.
Drivers are to be diverted via Twyford Avenue and Portsbridge roundabout until the stretch reopens.
Motorists are also warned of closures on the northbound carriageway for five consecutive nights from Monday.
The southbound lanes will shut overnight on Wednesday and Thursday, while signs are installed on the existing gantry by Stamshaw Park.
Contractors Colas said the works have been ‘meticulously planned’ in a bid to minimise disruptions.
Colas and the city council apologised after thousands of drivers were caught in traffic jams during works on the stretch at the end of June.
Simon Moon, the council’s head of transport and environment, said: ‘Night-time closures of the M275 are commonplace and, because of the low traffic levels at night, will generally cause very little disruption.
‘We are able to close the roads from 8.30pm but won’t do so unless traffic levels have subsided.
‘We work closely with various organisations in the city to anticipate traffic flows, for example the motorway won’t close until the last ferries have left the port.’
A Colas spokeswoman said: ‘Where we have to have to have planned closures we are trying to do as much of them as we can at night where the traffic is minimal.
‘We have meticulously planned it in.
‘It’s an absolute must that this work has to be done.’
Council leader Gerald Vernon-Jackson said: ‘It’s going to be difficult but we learnt a lot from the really big traffic problems at the end of June.
‘That is why these works are night, so it causes less of a problem for people commuting.
‘By doing this at night and giving much earlier warning to people I hope that it will cause much less disruption.’