I see others sometimes, but they are usually going the opposite direction.
However, I interval train every other day. I recover ride on Mon, Wed,Fri, and I hammer on Tuesday's and Thursday's. As a matter of fact, yesterday I did a personal best on my way in 12.3mi in 36:57. Still haven't been able to crack that 20mph average speed.
It's a total mental thing.
Things are going to get tougher when I begin riding my single speed in.