PEAK hour traffic has been thrown into chaos after a serious crash shut down two lanes of the Northbridge Tunnel.
The left and right eastbound lanes of the tunnel are blocked before East Parade on the Graham Farmer Freeway.
Drivers are urged to show extreme caution and avoid the area if possible.
Main Roads WA is reporting that traffic is heavily congested in the area.
— Main Roads WA (@Perth_Traffic) December 5, 2018