I have 5+ years of stickers on my neighborhood Eco-pass and decided to use it today to return home from Denver early.  I've always enjoyed the RTD between Boulder and Denver going back to the days when I was getting to know my husband (before we married).   Something about that metal and diesel smell and being high up off the pavement and knowing that nothing will get in the way.  Sailing up the High Occupancy Vehicle Lane like nobody's business.  And it's only on busses that I overhear conversations like, "I hope you don't have to go to jail....that would be sad."