West Sussex Highways is making changes in Warnham to stop narrow country lanes being used as a rat run.
Engineers will build out the junction of Strood Lane and A281 Guildford Road.
The changes will stop motorists from turning right out of Strood Lane and left into Strood Lane.
At the same time, West Sussex Highways will clear vegetation, refresh road markings, resurface the junction and complete drainage improvements.
Work starts on Monday, February 13 and lasts for three weeks, subject to weather.
It will be carried out during daylight hours from Monday to Friday.
Strood Lane will close and a signed diversion route put in place for road users.
Once completed, work then starts on Byfleets Lane in Warnham.
West Sussex Highways is installing a series of laybys and passing places along it, between Strood Lane and the Field Place Estate.
The roadside verge will be repaired and reinforced.
Work starts on Monday, February 27 and is expected to last for nine weeks.
Byfleets Lane will close during the work, with access provided to local businesses and residents.
A diversion route will be in place for road users.
West Sussex Highways will work during daylight hours between Monday and Friday.
The total cost of the two schemes is about £200,000.
West Sussex County Council’s Cabinet Member for Highways and Transport, Bob Lanzer, said: “We are making these improvements in response to the feelings of the local community in Warnham.
“They are concerned about the high levels of traffic using the country roads here.
“The changes to Strood Lane will encourage motorists to use more appropriate routes.
“Residents and businesses who use Byfleets Lane will also feel much safer once all the laybys and passing places are made more formal.”