‘Smart’ signs mean a safer Highway 217, ODOT says (Portland Tribune, 12/30/2015)
ODOT real time : know as you go [PDF] (2014) Oregon Department of Transportation
‘Smart’ signs mean a safer Highway 217, ODOT says (Portland Tribune, 12/30/2015)
ODOT real time : know as you go [PDF] (2014) Oregon Department of Transportation