POLICE were at the scene of a crash in Halls Head on Tuesday after two cars collided over the Mandurah Bypass bridge.
It is alleged a Nissan Pulsar collided with a Hyundai Elantra on Old Coast Road heading south at 2.20pm.
The cars were off to the side of the road but traffic became congested around the area as crews worked to clear the vehicles.
St John Ambulance treated one of those involved in the crash.
At this stage the age of the drive is not known.
In a separate incident a truck collided with a car at the intersection of Paganoni and Mandurah roads at 2.40pm on Tuesday.
There were no injuries in the crash and both were able to leave the scene.
In the third incident of the day, a car rolled over on Forrest Highway just past the intersection of Greenlands Road in West Pinjarra.
Emergency crews were on the scene with both occupants out of the vehicle.
It is unknown what injuries they sustained.