Motorists are advised of changed traffic conditions from next week along the Newell Highway, 14 kilometres north of Parkes.
Changed traffic conditions will be in place on a two kilometre section of the highway for investigation work.
Work will be carried out between 7am and 6pm from Monday to Friday and from 7am to 2pm on Saturday, and is expected to be completed within one week, weather permitting.
For the safety of workers and road users there will be a reduced speed limit of 40 km/h during work hours.
Motorists are advised to plan their trip, allow extra travel time and follow the direction of traffic control and all signs, including reduced speed limits.
Transport for NSW thanks motorists for their patience during this time.
For the latest traffic updates download the Live Traffic NSW App, visit livetraffic.com or call 132 701.