On July 31, 2017, the Federal Transit Administration (FTA) published a notice of proposed rulemaking in the Federal Register, for a proposed regulation that would establish new, experimental procedures to encourage use of public-private partnerships (P3s), joint developments and other private investment mechanisms in surface transportation capital projects. The rulemaking is linked to a statutory provision in the Moving Ahead for Progress in the 21st Century Act, which requires FTA to identify provisions at 49 U.S.C. chapter 53 and any regulations or practices thereunder that impede greater use of P3s and private investment. Potential private investors in public transportation infrastructure projects, as well as local and state transportation agencies that may be considering mechanisms of private funding, should be aware of the proposed new procedures. Public comments on the proposal are due September 29, 2017.