CVRIA Acronyms
 PAC: Payment Administration Center
 PC: Personal Computer
 PCA: Pre-crash Actions
 PCB: Professional Capacity Building
 PCS: Personal Communications System
 PDA: Personal Digital Assistant
 PDF: Portable Document Format
 PDU: Protocol Data Unit
 PER: Packet Error Rate
 PHY: Physical
 PID: Personal Information Device
 PII: Personal Identifiable Information
 PIN: Personal Identification Number
 PKI: Public Key Infrastructure
 PM: Performance Monitoring,  Particulate Matter
 PMS: Parking Management System
 PNG: Portable Network Graphics
 POC: Proof of Concept
 PPG: Privacy Protection Gateway
 PRL: Protocol Requirements List
 PSAP: Public Safety Answering Point
 PSID: Provider Service Identifier
 PSPEC: Process Specification
 PTS: Positive Train Separation or Public Travel Security
 PTVCW: Pedestrian in Signalized Crosswalk Warning