In the search for new sources of funding, federal, state, and local government officials in the U.S. have recently been exploring public private partnerships (PPPs). While promising, PPPs are neither a panacea nor an unwarranted gamble: both shining successes and troubling failures abound. Given the large variation in the efficiency, effectiveness, equity, and feasibility of public-private highway finance partnerships in past projects, federal and state officials have been enacting legislation and statutes to both promote PPPs and to protect public interests from the potential pitfalls of...