Did you know that shuttle buses operate in the nation's capital ferrying federal employees free of charge door-to-door from building to building? According to this article, there are over 158 of them operating on behalf of 18 federal agencies.
And they are mostly empty. Having ridden on the DoD system, I can attest to that fact, having almost always been one of a handful of people on mini or full-sized buses that ran every 15 or 30 minutes. Apparently, most of the buses operate within a 2.5 square mile near the mall downtown.
Apparently, tourist-taxpayers can afford to walk or take a public bus point to point in this area, but those whose salaries they pay need a free shuttle.