A major highway has been shut in the Shire of Harvey due to a serious crash on Friday night.
Forrest Highway was closed both directions after a crash near Riverdale Road in Myalup around 8.15pm.
The highway is now only shut southbound between Johnston and Riverdale Road.
It is unknown how long the highway will be shut with emergency services onsite.
Main Roads WA urged commuters to seek an alternate route with detours available via Johnston Road.
Get the latest news from thewest.com.au in your inbox.
Sign up for our emails