A package of safety improvements have got underway on the A64 between Bilbrough and Tadcaster this week.
Work includes installing high visibility road studs, renewing road markings and clearing vegetation.
The work is taking place between March 11-16, and to minimise any disruption to drivers, is taking place overnight from 8pm to 6am.
Highways Agency project manager, Steven Wright, said: “This work will improve safety along this section of the A64.
“While it is being carried out we advise road users to plan their journeys to avoid delays.
“We encourage all drivers to drive carefully along the diversion route, keeping within the speed limit, and concentrating on the road ahead.”
During the work the westbound A64 will be closed between Bilbrough Top and Headley Bar.
Clearly signed diversion routes will be in place.
Traffic will be diverted via the A1237 (York Ring Road), then onto the A59 to join the A1(M) where traffic will travel south to rejoin the A64 at Bramham.
Traffic information for major routes from www.highways.gov.uk/traffic