1. Short title This Act may be cited as the Bridge Investment Act . 2. Bridge investment program (a) In general Title 23, United States Code, is amended by inserting after section 123 the following: 124. Bridge investment program (a) Definitions In this section: (1) Eligible project The term eligible project means— (A) a large project to repair, improve, rehabilitate, or replace a bridge on a public road; (B) a medium or small project to repair, improve, rehabilitate, or replace a bridge on a public road; and (C) a program of medium or small projects to repair, improve, rehabilitate, or replace a bridge on a public road. (2) Large project The term large project means a project with total eligible project costs, as determined by the Secretary under subsection (j), of greater than $100,000,000. (3) Medium or small project The term medium or small project means a project with total eligible project costs, as determined by the Secretary under subsection (j), equal to or less than $100,000,000. (4) Nationally or regionally significant project The term nationally or regionally significant project means a large project— (A) for which an eligible applicant seeks more than $500,000,000 of assistance under this section