A crash on the Narrows Bridge has caused peak-hour gridlock for northbound motorists.
Main Road WA has advised motorists to take it slow on approach with the left lane blocked.
It comes as an accident on Roe Highway westbound, just before the Spencer Road overpass in Thornlie, has been cleared.
Traffic is heavy in the area.
Meanwhile, the debris from a crash on Roe Highway northbound near Kalamunda Road in High Wycombe has been cleared, with traffic starting to flow normally.
An earlier crash on Kwinana Freeway northbound just before the Thomas Road off-ramp in Bertram has also been cleared.