A bundle of useful info from this – The Pocket Guide to Transportation – from the U.S. Department of Transportation.
Like what governments spend on highways and transit:
And what revenues they get from highways and transit:
Let the interpretations begin. (Like expenditures going up for highways, revenues going down. For transit, both going up.) And look at how the feds cut transit expenditures in 2007.
UPDATE: Eric Doherty provides a comparative link for Canadian spending on transit –