Danbury police have arrested a man for a two-car crash last week that knocked out power around the mall.  21-year old David Turcios was charged with reckless driving, improper passing and failure to obey signs and road markings.  He crashed head on into a pickup truck at the intersection of Park Avenue and Segar Street Thursday afternoon.  Witnesses said the BMW appeared to be racing a vehicle on Park Avenue as the truck turned left onto Segar.  Police are searching for the driver of the other vehicle, which reportedly left the scene.  Turcios also hit a traffic control box, knocking out power to the traffic light.