To amend title 49, United States Code, to allow for additional transportation assistance grants.

Expands the urbanized area formula grants program to include public transit projects: (1) in urbanized areas with a population of at least 200,000, and urbanized areas with a population of between 200,000 and 400,000, if the state or regional authority that provides public transportation for the area operates less than 100 buses in fixed-route service in the area during peak service hours; and (2) in urbanized areas with graduated populations of between 400,000 and capping out at 1 million or more. Establishes certain grant limits for such projects.

Revises grant eligibility requirements for FY2010-FY2015 for such projects in urbanized areas with a population of at least 200,000.