A crash on Forrest Highway in Myalup on Sunday afternoon brought down powerlines and led to major traffic delays.
Nobody was seriously injured in the crash which happened just before 4pm.
Police said a vehicle hit a power pole, causing it to fall, before the car and the trailer it was towing rolled.
Northbound traffic was delayed while fire crews extinguished a small blaze sparked by the crash.
The rescue helicopter was called, but was later stood down.