These two routes serve as an introduction to the Imperial Sand Dunes Recreation Area. Route A takes you to Glamis and the north central dunes area, including Oldsmobile Hill. Route B traverses the entire western edge of the dunes. Open to licensed and green-sticker vehicles. Fee area, permit required. Safety flags required. Obey all posted regulations. Camping is first-come, first-served. Supplies and gas available at Glamis Beach Store at premium prices.