Fundamentals of Transportation/Transit In this unit, we cover
some of the major questions one might have about public transit,
with a focus on the United States (US): the what, how, who,
where, why, and when. This covers the major facets of transit as
it is currently provided and used in the US. Space does not
allow a more extensive treatment of the history of public
transit in the US; interested readers should check out the
reference by Cudahy, among others. In many countries besides the
US public transit is much more ubiquitous and more heavily used
than in the US; if anything, the US is far behind many of these
other countries in our understanding of what role public transit
plays in the transportation system as a whole. What is public
transit?  We define public transit as a mode of transportation
that involves moving persons from one place to another using a
common form of conveyance, allowing multiple persons to share a
common vehicle while traveling. This possibly includes a wide
variety of potential se