TRB’s Transit Cooperative Research Program (TCRP) Research Report 191: Public Transportation Guidebook for Small- and Medium-Sized Public-Private Partnerships (P3s) serves as a resource to explore, evaluate, initiate, plan, and implement small- and medium-sized public-private partnership (P3) initiatives. The guidebook addresses why and when to consider P3s for small- and medium-sized initiatives, what types of initiatives.. read more →