Perth motorists are facing another frustrating peak-hour crawl after a crash inside the Northbridge Tunnel slowed traffic heading westbound.
The left lane inside the tunnel was closed by incident response crews, with traffic banking up on approach as drivers were urged to merge safely.
The crash added to congestion already building across the CBD road network during the morning rush.
Further delays were possible near the Loftus Street entry to the Graham Farmer Freeway eastbound, where roadworks forced the closure of the left lane.
Speed limits through the area were reduced to 40km/h, although traffic was still flowing.
Drivers were also warned earlier about debris on the Kwinana Freeway northbound after Canning Highway at Como.
A large bag was affecting the left lane and contributed to slow traffic during the morning peak before it was later cleared.
Motorists have been urged to proceed with caution and allow extra travel time.
Get the latest news from thewest.com.au in your inbox.
Sign up for our emails