The project will get underway on Monday, 04 April and finish in August.
The scheme involves replacing 82 street lights with 73 energy efficient lights as well as resurfacing sections of the carriageway between Offington Corner and Cote Street using overnight carriageway closures.
The resurfacing phase is due to be completed by the end of April.
Highways England asset manager for Sussex, Peter Philips said: "We will be resurfacing sections of the carriageway that is reaching the end of its life and replacing 82 lights to maintain safe and reliable journeys for drivers on the A27 through Worthing.
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"We have carefully planned the work to be carried out with any closures overnight, when we know traffic flows are lowest, to minimise disruption."
The A27 Offington roundabout will be closed for resurfacing overnight, between 8pm and 5am, from Monday, 04 April until Friday 22 April. Diversions will be in place.
Work to replace the lights will be carried out between 9:30am and 3:30pm as well as during carriageway closures between 9pm and 6:30am from Monday, 11 April.
In addition, the A27 will be closed in both directions between the Grove Lodge roundabout and the Clapham junction on the following dates:
• Monday, 18 April to Friday, 22 April.
• Monday, 09 May to Friday, 14 May.
• Monday, 13 June to Friday, 18 June.
• Monday, 11 July to Friday, 15 July.
• Monday, 01 August to Friday, 05 August.
(LM)
