Traffic flow on the Causeway was temporarily reduced to one lane yesterday due to a three-vehicle collision involving a car, a truck and a motorcycle.A police spokesman said the car driver, a 60-year-old Pembroke man, was apparently not injured but was taken to King Edward VII Memorial via ambulance for medical assessment.The motorcycle rider, a 63-year-old Pembroke man, sustained relatively minor injuries which did not require hospital treatment. No other injuries were reported.All three vehicles were damaged, the accident occurred around 11am.Meanwhile, police arrested two people on suspicion of impaired driving over the weekend as the Selective Traffic Enforcement Programme (STEP) continues.Another seven people were arrested for outstanding warrants and liquor licence checks were conducted at various licensed premises throughout the Island.