The works, which began on Monday (January 31), are being led by Scottish and Southern Electricity Networks (SSEN), with a 40m trench excavation at the junction of Ford Lane, to enable upgraded connection from substation. A diversion will be in place 'all the time' until Friday, February 11.
A motorist, travelling from Rustington towards Chichester, was surprised by the road closure on Monday morning. They said there was 'no warning sign' to stop people from driving up to a set of cones, which have blocked the road both ways.
"We had to turn round and drive back and there were a lot of other people coming up as well," the motorist added.
West Sussex Highways said SSE is responsible for the works but confirmed it is aware of the situation.
A spokesperson added: "We are going to go out there and ensure there are enough signs to allow advanced warning.
"We will ensure what they [SSEN] have put in place is correct."
In a statement on Tuesday afternoon (February 1), SSEN said that, in preparation for the works taking place on Ford Lane, a road closure and diversion plan was agreed with the local council.
A spokesperson added: “This includes comprehensive signage situated prominently on the roads leading to Ford Lane.
“This morning two additional signs were added on Ford Lane, to ensure motorists have all necessary information.
“SSEN would like to thank motorists for their patience while we undertake work to improve the local network.”