Motorists on Narellan Road should expect delays around lunchtime on Tuesday.
A car crashed into a traffic light on the Hume Highway off-ramp to Narellan Road.
Emergency services crews were called out to the incident about 10.55am on August 7.
One westbound lane is closed to traffic.
Motorists are advised to reduce speed and expect delays.
Emergency services and RMS personnel remain at the scene.