I have a candy apple red 1800 R and was on I-70 on Saturday morning heading west. I was waiting on the side of the road just west of Frederick and then joined a group that I ride with and headed off to Harpers Ferry. I ride with a group of mostly Jewish riders called the SOBs, Semites on Bikes. You don't have to be Jewish to join our group, many aren't, but most of us are. We generally ride all around Baltimore, up into PA, and sometimes go out towards Harpers Ferry. All we do is eat, ride, and laugh at each other.
I am not sure if I am the one you saw but I was there.
Harry Z.