(Portland, OR)  --  Portland police say one of their motorcycle officers was taken to a hospital following a crash involving a suspected impaired driver.  Authorities say the officer was stopped in the left turn lane of Southeast McLoughlin Boulevard near Holgate shortly before nine o'clock last night when a car hit the motorcycle from behind.  Police say the officer's injuries aren't serious.  The driver of the other vehicle, who remained at the scene, was arrested for suspicion of DUII.