Monday morning commuters are facing bumper-to-bumper traffic after a slew of crashes on major Perth roads.

A multi-vehicle crash on Rockingham Road southbound, just before Russell Road in Munster, has reduced the road to a single lane, with police on site shortly after 6am.

Traffic heading south through the area is heavy, with motorists urged to merge safely and take care through the crash zone.

A vehicle rollover has also caused delays in Bedfordale, with a section of Albany Highway westbound after Dryander Drive closed shortly after 7am.

Drivers are being urged to avoid the area and seek an alternate route.

In Kewdale, a crash on Roe Highway northbound before Tonkin Highway has caused slow traffic on approach, with the left emergency lane blocked and towing services on site.

Main Roads is urging motorists travelling through the area to proceed with caution.

More to come.