Peak hour breakdown on major Perth freeway causing chaos

A breakdown on Mitchell Freeway northbound in Osborne Park is causing traffic headaches for motorists heading home on Thursday evening.

The breakdown occurred on Mitchell Freeway just after Hutton Street and was reported by Main Roads at 5.43pm.

The right lane has been closed by Incident Response, and traffic is heavy leading up to the site.

Main Roads has warned motorists to "exercise extreme caution" if driving in the area.