To get everyone rolling in a timely fashion, and to maintain adequate spacing between groups, the route could begin at a crossroads where riders would leave in one direction but the route would bring them again through the crossroads on the road they did not leave on, sort of like riding a figure eight. The first group would take one road, the next group would take the other road. They would travel the same route, and in the same direction, but both start at a different point on the route. That would give spacing and speed of departure. .