Motorists face delays on one of the main routes into St Helier for the next three months.
Drainage work starts today (5 February) on the Inner Road (La Route de St Aubin) between West Park and Bay View Court.
Delays are expected around West Park for the next 12 weeks.
Sections of the westbound carriageway will be closed and temporary traffic lights will be in use.
The government project will increase the capacity of the sewage network when new houses are eventually linked to it.
Surface water from rainwater run off will be separated from the foul drainage network to ease pressure on the First Tower Pumping Station, the liquid waste network and Bellozanne Treatment Works.
A report published last May highlighted how Jersey's ageing sewage system is struggling to cope with a population double the size it was designed for, and is one of the biggest barriers to the delivery of new homes to ease the housing crisis.
The work on the Inner Road is expected to take until 1 May to complete.
'Momentous' week in Jersey's States
Plans to charge wealthiest patients for medical travel
Railway Walk reopens 'several weeks' ahead of schedule
New bar opening at former Rojo and X site to evolve Jersey's nightlife
Former Chief Minister seeks re-election
Château Vermont to become home to new music campus
St Saviour break and entry suspect pictured posing on motorbike
'Overstretched' neurology department following under-experienced managers
