DRIVERS are warned they face delays as £280,000 of improvements works get under way.
Work will start on creating a dedicated left-hand lane for traffic leaving the A27 on to Cathedral Way at Chichester in January.
It will feed into Fishbourne Road East, taking shoppers to the Tesco store there.
Traffic which gets stuck exiting Fishbourne Road East will have a dedicated left-hand lane on to Cathedral Way and a new pedestrian footway along Fishbourne Road East will be built.
The project is part of a planning agreement West Sussex County Council had with Tesco when it was extended to become a Tesco Extra.
The supermarket giant is forking out £150,000 while the remaining cash will come from other development money in the Chichester district.
Work is expected to be finished by late April.
Shoppers will be able to access the Tesco Extra throughout the works.
Cathedral Way will stay open throughout – except for 10 nights across the 14-week period – but the carriageway will have to be narrowed to keep the workforce safe. Work during daytime hours will take place between 7.30am and 5pm.
Motorists are advised to find alternative routes during peak hours.
Councillor Pieter Montyn, in charge of highways and transport, said: ‘We apologise in advance for any inconvenience this work will cause in the new year.’