Clare Police and emergency services were called to a crash scene in the early hours of Thursday morning.
A fallen tree on Farrell Flat Road near Hill River was the cause of three separate accidents with the passenger of one car taken to hospital with minor injuries.
The collisions occurred on a bend at about 6:20am with heavy fog blanketing the road.
The first car was travelling away from the Clare township at 110 kilometres/hour and saw the tree with enough time to perform an evasive action which resulted in the vehicle veering off the side of the road into a nearby paddock.
A short time later a second car travelling in the same direction collided with the tree having not seen it in time.
The force from the collision sent the 4WD Ute sent the car airborne which caused it to roll and moved most of the tree from the road.
The passenger in this car was taken to hospital.
A third car travelling into Clare collided with debris from the tree which was left behind.
Along with police, two ambulances arrived at the scene to treat the four occupants involved.
Country Fire Service and State Emergency Service responders were also present.
The log was later removed by the Clare and Gilbert Valleys Council.
An updated weather warning was issued on Thursday morning by the Bureau of Meteorology for parts of the Mid North.
Police remind drivers to remain vigilant and drive to the conditions.