The Monaro Highway is closed in both directions in Michelago, near the ACT Border, due to a serious multi-vehicle crash near Kelly Road.
Light vehicles are being diverted around the crash on Kelly Road.
Heavy vehicles are advised to avoid the area as there is currently no suitable diversion. Heavy vehicles already on site are being parked.
Motorists are advised to allow extra travel time time and exercise caution.
Motorists should also follow the directions of emergency services and traffic crews.
Due to the nature of the crash, the highway is expected to be closed for some time.
For the latest traffic information, visit www.livetraffic.com, download the Live Traffic NSW app or call 132 701.