Major day-long disruption is expected to hit the centre of Haywards Heath until December as three sets of excavation works begin on different sections of the A272.
The work is being carried out on the east-west trunk road at South Road opposite Victoria Park; at Muster Green South, close to the busy one-way system; and at Bolnore Road, close to Isaacs Lane, where traffic heads south to Burgess Hill.
All the sites are within less than a mile of each other and affect some of the busiest stretches of road in Haywards Heath.
The work, which began on Monday, is to “excavate and locate existing electrical cables” and is being done by the Gas Transportation Co Ltd.
Traffic, which includes main A272 east-west commuters travelling across the county, also includes local commuters, shoppers and schools traffic.
All the road works, which are surrounded by red barriers and take up part or all of one carriageway, will be controlled by multi-way signals.
The A272 disruption is the latest large scale work to affect Haywards Heath and its surrounds.
Currently, work is also taking place in Rocky Lane to widen the road to accomodate traffic from new housing and as part of the Haywards Heath bypass project, which will eventually link to Bolnore Village.
Similarly, the B2184 London Lane, Cuckfield is closed while work is carried out on “drainage investigation and pipe repair”.
The situation in Haywards Heath means drivers trying to go south to Burgess Hill face long delays on the main two link roads - Rocky Lane and Isaacs Lane.