My favorite mode of mass transit is the bus. The Greyhound Bus, the Peter Pan Bus, Megabus, Trailways, Jefferson Lines. I like them all. When you ride around the country on the bus, you get to meet a lot of interesting people. For no extra charge, you get to see the landscape of this great country of ours. You get to pull into a new city and get a feel for it. Every two hours.
On many of these buses, you can adjust your seat. Many of them have bathrooms right inside the bus. You also get to stop in a lot of different towns to try their bathrooms out too.