The Kings Highway has reopened in both directions at Mulloon, east of Bungendore, after a serious crash involving a truck and two cars.
The highway was closed between Goulburn Road and Mecca Lane.
Diversions have been lifted, and traffic conditions have returned to normal through the area.
For the latest traffic information, download the Live Traffic NSW app, visit www.livetraffic.com or call 132 701.
The Kings Highway closed in both directions between Braidwood and Bungendore due to a multi car crash (as at 12:30pm on Thursday 13 January).
Motorists are advised to use an alternative route, exercise caution and reduce speed.
Westbound motorists are being turned around at Goulburn Road.
Emergency Services are on the scene.
For the latest traffic information visit livetraffic.com