| Acronym |
Definition |
| P&S | Plans and Specifications |
| PD | Project Development |
| PD | Per Diem |
| PDDM | Project Development and Design Manual |
| PDF | Portable Document Format (The file extension of Adobe's Acrobat Reader program) |
| PDP | Professional Development Program |
| PE | Preliminary Engineering |
| PE | Professional Engineer |
| PennDOT | Pennsylvania Department of Transportation |
| PFH | Primary Forest Highway |
| PHRA | Preserving the Historic Road in America |
| PIH | Plan-in-Hand |
| PIR | Project Identification Report |
| PL | Public Law |
| PLH | Public Lands Highway |
| PP&A | Planning and Administration Engineer |
| PRA | Park Roads and Parkways Program |
| PRDTPW | Puerto Rico Department of Transportation & Public Works |
| PRMS | Program Resource Management System |
| PRP | Park Roads and Parkways Program |
| PS&E | Plans, Specifications, & Estimate |
