I've been on Route 211 about four or five times this year. I have never had any issues with police but I do know two people that did. Both times it was on the stretch of 211 prior to entering the mountains, near the Shell gas station.
I believe if we take it easy on that brief stretch (about a 10 minute ride), we should be fine.
If you come from the Laurel area, Frank is right - I-495 toward Northern Virginia, I-66 West toward Front Royal, take the Route 15 exit toward Haymarket and Sheetz is around the corner. The ride from Sheetz to Route 211 is all back roads...except that small stretch of highway that I previously mentioned.