Motorists are warned to beware diversions and delays on the A19 over the next fortnight.
Resurfacing work along a five-mile stretch of the dual carriageway began at 8pm on Sunday and continue until Friday, July 27, at 6am.
The Highways England project affects the southbound A19 between the B1320 Peterlee Interchange and the A179 Hartlepool turn-off at Sheraton.
Motorists will be diverted through Peterlee to Horden via the B1320 Burnhope Way and A1086 coast road before heading into Hartlepool and rejoining the A19 via the A179 Hart Bypass.
The 8pm-6am overnight shutdown takes place from Sundays to Fridays with closures suspended on Saturday, July 21.
When the stretch is open during the day, however, a 50-mile-per-hour speed restriction will be in place and southbound laybys will be closed.
Southbound slip roads to the A19 at Passfield Way, Peterlee, and at Castle Eden Dene will also be coned off so that work can take place in safety.
Gaps in the central reservation will be shut as well to prevent northbound traffic cutting across the dual carriageway during the closures.
A Highways England spokeswoman said: "Motorists will be diverted along the B1320 into Peterlee, the A1086, the A179 and rejoin the A19 there."