A single vehicle accident involving a truck hauling a manufactured home blocked westbound lanes of Interstate 84 in Hood River for about 90 minutes Monday morning.  According the Oregon State Police, a preliminary investigation indicated the truck was exiting the freeway at exit 63 when for an unknown reason it veered to the left and entered the unpaved shoulder of the freeway, striking the exit 63 sign and two fog markers before coming to rest blocking the westbound lanes of travel.  The truck operator, 36-year-old Michael Cannon of Hermiston, was taken by ambulance to Providence Hood River Memorial Hospital for treatment of injuries.  The accident occurred just before 9:30 Monday morning.  Oregon Department of Transportation assisted at the scene by diverting traffic off the exit and back onto I 84 westbound.  The crash remains under investigation.