I have to drive the motorhome to Washington DC

If you're coming from the south you would take 495 - "Outer Loop" to exit 25 which is US Route 1; turn left and go 3/4 mile and turn right onto Cherry Hill Road. Campground is 1 mile up on left. Very nice campground. These directions have worked for us and they come from Cherry Hill CG website. Note that 495 makes a circle around DC and has an "outer loop" and an "inner loop" just depends on whether you want to be on the east or west side of DC in traveling thru. Hope this helps. Enjoy.