(Tillamook, OR)  --  Authorities are investigating a head-on crash in Tillamook County that sent three people to the hospital.  Officials say the wreck happened Saturday night along Oregon 6 when a car tried to pass in a no-passing zone and slammed into an oncoming vehicle.  The collision injured three people, one of them seriously.  Thirty-four-year-old Amber Maerz [[ mairs ]] of Newberg, who complained of chest pain but declined treatment, was cited for reckless driving.