The A47 was fully closed in one direction last night – and will happen again until Friday morning – with drivers asked to follow a 16.5-mile diversion around Norwich.
Overnight closures are in force on the Norwich Southern Bypass from 8pm until 6am, every day until May 28.
A47-Diversion-route-for-overnight-closures
The closures affect both lanes of the westbound carriageway between Postwick and Thickthorn.
The eastbound lanes are unaffected.
A suggested diversion route takes drivers along the Northern Distributor Road (NDR) before heading down to the Norwich ring road and around the city to re-join the A47 at Thickthorn.
A notice from Highways England said: "Westbound traffic will be diverted onto the A1270 and join Holt Road/Cromer Road after Norwich International airport.
"They will join Boundary Road (part of inner ring round anti clockwise) then joining the A11 at Mount Pleasant and re-join the A47 at Thickthorn."
The disruption is expected for four consecutive nights, lasting until 6am on Friday morning.
• For up-to-date information about the county's roads, visit our LIVE Norfolk traffic map.
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