| ADA | Americans with Disabilities Act |
| ANSI | American National Standards Institute |
| APTA | American Public Transportation Association |
| AORA | Areas of Response Assistance |
| ASME | American Society of Mechanical Engineers |
| ASTM | American Society for Testing and Materials |
| ASTM | American Society for Testing and Materials International |
| AVL | Automatic Vehicle Locator |
| BRT | Bus Rapid Transit |
| CapWIN | Capital Wireless Integrated Network |
| CBNR | Chemical, Biological, Nuclear, Radiological |
| CCTV | Closed-Circuit Television |
| CDC | Centers for Disease Control |
| CDPD | Cellular Digital Packet Data |
| CFR | Code of Federal Regulations |
| CNG | Compressed Natural Gas |
| ConOps | Concept of Operations |
| COTS | Commercial Off The Shelf |
| CPTED | Crime Prevention Through Environmental Design |
| DCS | Distributed Control Systems |
| DHHS | Department of Health and Human Services |
| DOD | Department of Defense |
| DOS | Department of State |
| EMI | Electro-Magnetic Interference |
| FAH | Foreign Affairs Handbook |
| FCRA | Federal Fair Credit Reporting Act |
| FTA | Federal Transit Administration |
| GETS | Government Emergency Telecommunications Service |
| GIS | Geographic Information Systems |
| GPA | Grade Point Average |
| GPS | Global Positioning System |
| GSA | General Services Administration |
| HVAC | Heating, Ventilation, and Air Conditioning |
| ID | Identification |
| IDS | Intrusion Detection System |
| IEC | International Electrotechnical Commission |
| IEEE | Institute of Electrical and Electronics Engineers |
| IESNA | Illuminating Engineering Society of North America |
| IETF | Internet Engineering Task Force |
| IIMS | Integrated Incident Management System |
| INS | Immigration and Naturalization Service |
| ISP | Internet Service Provider |
| ISO | International Organization for Standardization |
| ITE | Institute of Transportation Engineers |
| ITS | Intelligent Transportation Systems |
| MDT | Mobile Data Terminals |
| MVR | Motor Vehicle Record |
| NEMA | National Electrical Manufacturers Association |
| NFPA | National Fire Protection Agency |
| NIOSH | National Institute of Occupational Safety and Health |
| NRC | National Research Council |
| NTCIP | National Transportation Communications for ITS Protocol |
| NTI | National Transit Institute |
| NYCTA | New York City Transit Authority |
| NYCT | New York City Transit |
| OCC | Operations Control Center |
| OEM | Office of Emergency Management (New York Mayor's Office) |
| OTS | Off-the-Shelf |
| PA | Public Address |
| PD | Probability of Detection |
| PDA | Personal Digital Assistant |
| PIDS | Perimeter Intrusion Detection System |
| PIN | Personnel Identification Number |
| PROTECT | Program for Response Options and Technology Enhancements for Chemical/Biological Terrorism |
| PSI | Pounds per Square Inch |
| RF | Radio Frequency |
| SAE | Society of Automotive Engineers |
| SCADA | Supervisory Control and Data Acquisition |
| SDO | Standards Development Organization |
| TCIP | Transit Communications Interface Protocols |
| TCRP | Transit Cooperative Research Program |
| TNT | Trinitrotoluene |
| TRB | Transportation Research Board |
| TSA | Transportation Security Administration |
| TSWG | Technical Support Working Group |
| TV | Television |
| TVA | Threat and Vulnerability Assessment |
| TWIC | Transportation Worker Identification Credential |
| UHF | Ultra High Frequency |
| US | United States |
| VHF | Very High Frequency |
| VMS | Variable Message Sign |
| WiFi | Wireless Fidelity |
| WPS | Wireless Priority System |
| WMD | Weapons of Mass Destruction |