[jstalin]

There is a lot more interesting data in the NTD that I wish someone with more programming skills than me could put together in a graphical way. For instance, you can calculate the amount of CO2 emitted per passenger and per passenger mile. You can calculate the subsidy per rider and per passenger mile. You can even determine the average utilization of the system by checking the average number of riders on each bus.

From doing some of that work manually, I found that many (if not most) public transit systems are emitting more CO2 than if all of the passengers had ridden in a car, with the national average of 1.7 riders per car.