I'm leading a group from Greenbelt MD to Washington DC for Bike to Work Day this Friday, May 4. I still don't know who will show up or if this is the first time some of them have ridden in traffic. This is my first time as ride leader, so any tips you might have would be appreciated. I'll be riding my usual commuting bike, a Raleigh 10 speed road bike. The route is about 16 miles, in typical big city traffic.