I saw a guy a few months ago riding his bike on the GW Parkway (no shoulder) near Reagan National Airport. The speed limit is 40 mph, but most cars are doing 60 and some scofflaws as high as 80. I was 20 feet to the right on the beautiful Mount Vernon Trail, paved and designed for bikes and peds. Couldn't understand what the guy was thinking. "I'm on a road bike, so I should ride on the road"? This is the third time I've seen people riding on the Parkway, which is really nothing more than a high speed highway. The others were a salmon and a couple of tourers. Maybe it is google maps, but you'd think common sense would rule.