Nottinghamshire's A453 overnight road closure starts
A six-mile stretch of the A453 from Nottingham to junction 24 of the M1 is being shut for four weeks.
The Highways Agency said the £1.68m resurfacing project was needed to prepare for the road to be widened into a dual carriageway in 2015.
Diversions will be put in place from 20:00 GMT till 05:30 every night to minimise congestion, the agency said.
Motorists going into Nottingham will face a 15 mile (24.1 km) diversion.
Traffic going to Ratcliffe-on-Soar power station will travel along an 18-mile (30 km) diversion which passes through a number of small villages.
Full details of the closure can be found on the Highways Agency website.