Professionals working across Travel, Transportation & Logistics can use this glossary to interpret operational, regulatory, safety, funding, technology, and performance terminology. It focuses on acronyms encountered in the Public Transit & Mobility Agencies (Bus And Rail Authorities) Practice, supporting clearer decisions and stakeholder communication.
A B C D E F G H I L M N O P R S T U V W Z
| A | |
| ABT | Account-Based Ticketing: A fare architecture in which travel rights, transaction history, and fare calculations are maintained in a back-office account rather than solely on a physical card or ticket. |
| ADA | Americans with Disabilities Act: A United States civil-rights law requiring accessible transit vehicles, facilities, communications, and services, including complementary paratransit for eligible riders. |
| ADAAG | Americans with Disabilities Act Accessibility Guidelines: Accessibility guidelines addressing the design of facilities, vehicles, and related elements used by people with disabilities. |
| AFC | Automated Fare Collection: The equipment and software used to issue fare media, validate trips, process payments, enforce fare rules, and reconcile passenger revenue. |
| AIM | Asset Inventory Module: The National Transit Database component through which agencies report specified capital assets and condition information used for asset-management analysis. |
| APC | Automatic Passenger Counter: An onboard system that records passenger boardings and alightings, supporting ridership reporting, service planning, load analysis, and schedule design. |
| APTA | American Public Transportation Association: A United States industry association that develops standards, conducts peer reviews, supports research, and represents public transportation organizations and suppliers. |
| ATC | Automatic Train Control: An umbrella term for systems that control train movement and may integrate protection, operation, and supervision functions to improve safety and capacity. |
| ATO | Automatic Train Operation: Technology that automates functions such as acceleration, speed regulation, station stopping, and door coordination while operating within the signaling system. |
| ATP | Automatic Train Protection: Safety functionality that enforces movement authorities and speed limits, intervening when necessary to prevent collisions, overspeed events, or signal overruns. |
| ATS | Automatic Train Supervision: A control layer that monitors train positions, regulates service, manages routes, and helps controllers respond to delays and disruptions. |
| AVL | Automatic Vehicle Location: Technology that determines and communicates vehicle position, enabling dispatch, real-time passenger information, schedule-adherence monitoring, and service analysis. |
| B | |
| BABA | Build America, Buy America Act: United States domestic-content requirements applying to federally funded infrastructure, with significant implications for transit procurement, supplier certification, and waiver planning. |
| BCR | Benefit-Cost Ratio: A project-appraisal measure comparing monetized benefits with costs; it is frequently used to evaluate and prioritize transit capital investments and grant applications. |
| BEB | Battery-Electric Bus: A bus powered solely by rechargeable batteries, requiring coordinated planning for routes, charging infrastructure, utility capacity, maintenance, and operating range. |
| BIL | Bipartisan Infrastructure Law: The common name for the United States Infrastructure Investment and Jobs Act, which authorized major transit formula funding, competitive grants, and infrastructure programs. |
| BRT | Bus Rapid Transit: A bus-based service model using features such as dedicated lanes, frequent service, priority at intersections, platform-level boarding, and off-board fare collection. |
| C | |
| CAD/AVL | Computer-Aided Dispatch/Automatic Vehicle Location: An integrated operations platform combining vehicle-position data with dispatch, incident management, operator communication, and service-control functions. |
| CAP | Corrective Action Plan: A documented set of actions, responsibilities, and deadlines for resolving identified safety deficiencies, audit findings, or regulatory noncompliance. |
| CBTC | Communications-Based Train Control: A rail signaling system that uses continuous train-to-wayside communications and precise location data to maintain safe separation and increase line capacity. |
| CCTV | Closed-Circuit Television: Video-surveillance equipment used on vehicles and at facilities to support passenger security, incident investigation, operational awareness, and asset protection. |
| CE | Categorical Exclusion: A class of actions that normally does not require an environmental assessment or environmental impact statement under United States federal environmental review procedures. |
| cEMV | Contactless Europay, Mastercard, and Visa: Contactless bank-card payment technology that enables riders to tap eligible cards or devices directly at transit fare validators. |
| CIG | Capital Investment Grants: A United States federal program supporting eligible new fixed-guideway projects, extensions, corridor improvements, and certain capacity-enhancement investments. |
| CIP | Capital Improvement Program: A multiyear portfolio of planned investments in vehicles, guideways, stations, facilities, technology, and other long-lived assets. |
| CMAQ | Congestion Mitigation and Air Quality Improvement Program: A United States federal funding program for transportation projects that reduce congestion and transportation-related air pollution, including eligible transit improvements. |
| CMAR | Construction Manager at Risk: A project-delivery approach in which a construction manager provides preconstruction services and later assumes responsibility for delivering work within agreed commercial terms. |
| CM/GC | Construction Manager/General Contractor: A collaborative delivery method that brings the contractor into design development before negotiating construction packages, price, and risk allocation. |
| CNG | Compressed Natural Gas: A gaseous vehicle fuel used by many bus fleets, requiring specialized fueling, storage, ventilation, inspection, and maintenance arrangements. |
| COA | Comprehensive Operational Analysis: A structured review of routes, schedules, ridership, productivity, coverage, reliability, and community needs used to redesign or optimize service. |
| COOP | Continuity of Operations: Planning that enables essential mobility, control, communications, and administrative functions to continue during emergencies or major disruptions. |
| CPTED | Crime Prevention Through Environmental Design: Design principles that use visibility, access control, lighting, territorial definition, and activity patterns to improve security at stations and facilities. |
| CTAA | Community Transportation Association of America: A United States association supporting community, rural, tribal, demand-responsive, and specialized transportation providers through training and technical assistance. |
| CTC | Centralized Traffic Control: A rail traffic-control system through which a central dispatcher remotely controls signals and switches across a defined territory. |
| CTPP | Census Transportation Planning Products: A specialized United States census data set used to analyze commuting patterns, worker flows, demographics, and travel markets for transportation planning. |
| CUTA | Canadian Urban Transit Association: The Canadian industry association representing public transportation systems, suppliers, governments, and related mobility organizations. |
| D | |
| DAMIS | Drug and Alcohol Management Information System: The federal reporting system used by covered United States transit employers to submit required drug-and-alcohol testing program data. |
| DB | Design-Build: A project-delivery method that places design and construction under a single contract, reducing owner interfaces and allowing greater overlap of project phases. |
| DBB | Design-Bid-Build: A traditional delivery method in which design is completed before construction is competitively procured under a separate contract. |
| DBE | Disadvantaged Business Enterprise: A United States program intended to ensure nondiscrimination and fair participation by eligible small businesses in federally assisted transportation contracts. |
| DBOM | Design-Build-Operate-Maintain: An integrated delivery model assigning design, construction, operations, and maintenance responsibilities to one private-sector contracting structure for a defined term. |
| DRT | Demand-Responsive Transport: Service whose routes, stops, or schedules adjust to passenger requests, including paratransit, microtransit, dial-a-ride, and other flexible operations. |
| E | |
| EA | Environmental Assessment: A United States environmental review document used to determine whether a proposed project is likely to cause significant environmental effects. |
| EAM | Enterprise Asset Management: An integrated approach and system for managing asset inventories, work orders, inspections, maintenance, condition, cost, and lifecycle decisions. |
| EIS | Environmental Impact Statement: A detailed analysis of significant environmental effects, alternatives, and mitigation measures for a major proposed federal action. |
| EMV | Europay, Mastercard, and Visa: A global payment standard for chip-based cards and devices that underpins many open-loop and contactless transit payment systems. |
| EOC | Emergency Operations Center: A facility or coordinated function from which leaders manage information, resources, interagency coordination, and decisions during significant incidents. |
| EVSE | Electric Vehicle Supply Equipment: Charging equipment and associated controls that safely deliver electricity to vehicles, including depot, on-route, and maintenance-facility installations. |
| EWT | Excess Wait Time: A reliability measure comparing actual passenger waiting with the waiting expected under regular service, particularly on high-frequency routes. |
| F | |
| FAR | Federal Acquisition Regulation: The principal rules governing direct United States federal procurement, also influencing contract clauses and practices encountered in federally supported transportation work. |
| FBR | Farebox Recovery Ratio: The percentage of operating costs covered by passenger fare revenue, used to assess cost recovery and inform fare and subsidy policy. |
| FCEB | Fuel Cell Electric Bus: An electric bus that generates onboard electricity from hydrogen, requiring specialized fueling, safety, maintenance, and supply arrangements. |
| FCI | Facility Condition Index: A condition measure comparing identified repair needs with an asset’s replacement value to support facility prioritization and capital planning. |
| FFGA | Full Funding Grant Agreement: A multiyear federal funding commitment used for qualifying major transit capital projects within the United States Capital Investment Grants program. |
| FMVSS | Federal Motor Vehicle Safety Standards: United States safety requirements governing vehicle design, construction, and performance that apply to relevant buses and other road vehicles. |
| FONSI | Finding of No Significant Impact: A federal environmental determination concluding that a project will not have significant effects requiring preparation of an environmental impact statement. |
| FRA | Federal Railroad Administration: The United States regulator responsible for railroad safety and policy, including oversight relevant to commuter rail operations and shared railroad corridors. |
| FRACAS | Failure Reporting, Analysis, and Corrective Action System: A closed-loop process for recording failures, identifying causes, implementing remedies, and verifying improvements in equipment and system reliability. |
| FTA | Federal Transit Administration: The United States Department of Transportation agency that provides transit funding, establishes program requirements, collects industry data, and oversees safety and compliance. |
| G | |
| GHG | Greenhouse Gas: A heat-trapping atmospheric gas measured in fleet, facility, and project emissions inventories and considered in decarbonization strategies. |
| GIS | Geographic Information System: Technology for managing and analyzing location-based data such as routes, stops, service areas, demographics, assets, incidents, and travel demand. |
| GoA | Grade of Automation: A classification describing how train-operating responsibilities are divided between staff and automated systems, from manual driving to unattended operation. |
| GPS | Global Positioning System: Satellite-based positioning technology used for vehicle tracking, stop announcements, schedule-adherence measurement, navigation, and passenger information. |
| GTFS | General Transit Feed Specification: A widely used data format for publishing routes, stops, schedules, calendars, fares, and related information to journey-planning applications. |
| GTFS-RT | General Transit Feed Specification Realtime: A companion format for publishing live trip updates, vehicle positions, and service alerts to customer-information platforms. |
| H | |
| HOV | High-Occupancy Vehicle: A vehicle carrying a specified minimum number of occupants; designated lanes may also provide priority or access for buses. |
| I | |
| ICS | Incident Command System: A standardized structure for managing emergencies through defined command, operations, planning, logistics, and finance responsibilities. |
| IIJA | Infrastructure Investment and Jobs Act: A United States law enacted in 2021 that authorized substantial transit, rail, accessibility, fleet, and infrastructure funding. |
| ISO 55001 | International Organization for Standardization 55001, Asset Management System Requirements: An international standard specifying requirements for establishing, operating, evaluating, and improving an organizational asset-management system. |
| ITDP | Institute for Transportation and Development Policy: A nonprofit organization that develops guidance and technical resources on sustainable urban mobility, including bus rapid transit and transit-oriented development. |
| ITS | Intelligent Transportation Systems: The application of communications, sensing, data, and control technologies to improve service management, traveler information, safety, and network performance. |
| L | |
| LEP | Limited English Proficiency: A designation for people who do not speak English as their primary language and may require translated information or language assistance to access services. |
| LNG | Liquefied Natural Gas: Natural gas stored as a cryogenic liquid for use as vehicle fuel, requiring specialized tanks, fueling equipment, and safety controls. |
| LOS | Level of Service: A framework for assessing service quality or operating conditions using factors such as frequency, coverage, capacity, reliability, travel time, and comfort. |
| LPA | Locally Preferred Alternative: The transit mode and alignment selected by local decision-makers for advancement through environmental review, design, funding, and implementation. |
| LRT | Light Rail Transit: An urban rail mode that typically operates electrically on exclusive, shared, or street-running rights-of-way with stations spaced for local or corridor service. |
| LRV | Light Rail Vehicle: A passenger rail vehicle designed for light rail service, often capable of operating in trains and negotiating street-running alignments. |
| M | |
| MDBF | Mean Distance Between Failures: A reliability measure showing the average operating distance between defined equipment failures, used to monitor fleet and system performance. |
| MDSF | Mean Distance Between Service Failures: The average distance traveled between failures severe enough to delay, interrupt, or remove a vehicle from passenger service. |
| MPO | Metropolitan Planning Organization: A federally required regional body that coordinates long-range transportation planning and investment programming in United States metropolitan areas. |
| MTBF | Mean Time Between Failures: A reliability metric expressing the average operating time between repairable equipment or system failures. |
| MTTR | Mean Time to Repair: A maintainability metric measuring the average elapsed time required to restore failed equipment to service. |
| MUTCD | Manual on Uniform Traffic Control Devices for Streets and Highways: The United States national standard governing traffic signs, signals, and pavement markings, including treatments affecting bus lanes, stops, and transit priority. |
| N | |
| NEMT | Non-Emergency Medical Transportation: Transportation for eligible people traveling to non-emergency healthcare appointments, sometimes coordinated with paratransit or human-services mobility programs. |
| NEPA | National Environmental Policy Act: The United States law requiring federal agencies to evaluate environmental effects and alternatives before undertaking or funding major actions. |
| NeTEx | Network Timetable Exchange: A European standard for exchanging public transport network, timetable, fare, and related reference data between systems. |
| NFC | Near-Field Communication: Short-range wireless technology used by contactless cards, smartphones, and validators in many electronic fare-payment systems. |
| NFPA 130 | National Fire Protection Association 130, Standard for Fixed Guideway Transit and Passenger Rail Systems: A widely applied standard addressing fire protection, life safety, emergency ventilation, and evacuation for rail systems and facilities. |
| NHTSA | National Highway Traffic Safety Administration: The United States agency responsible for motor-vehicle safety standards, defect investigations, recalls, and road-safety programs relevant to bus fleets. |
| NIMS | National Incident Management System: The United States framework for coordinating government, emergency services, infrastructure operators, and other organizations during incidents. |
| NPTSP | National Public Transportation Safety Plan: The federal plan establishing national safety performance measures, principles, and priorities for United States public transportation systems. |
| NTD | National Transit Database: The United States repository for financial, operating, asset, safety, and service data reported by recipients of federal transit assistance. |
| NTI | National Transit Institute: A federally supported institute providing training and professional-development programs for public transportation personnel and stakeholders. |
| NTSB | National Transportation Safety Board: An independent United States agency that investigates significant transportation accidents and issues safety findings and recommendations. |
| O | |
| OCC | Operations Control Center: The central facility that monitors service, controls rail or bus operations, coordinates incidents, and communicates with field personnel. |
| OCPP | Open Charge Point Protocol: An open communications protocol connecting electric-vehicle chargers with management systems, helping agencies avoid dependence on a single charging vendor. |
| OD | Origin-Destination: A representation of where passenger trips begin and end, used for route planning, network design, demand analysis, and investment evaluation. |
| O&M | Operations and Maintenance: The activities and resources required to run services and keep vehicles, infrastructure, facilities, and systems safe and available. |
| OSHA | Occupational Safety and Health Administration: The United States agency that establishes and enforces workplace safety and health requirements affecting maintenance shops, facilities, construction, and operations. |
| OTP | On-Time Performance: A service-reliability measure showing the proportion of trips or timepoint events occurring within an agency’s defined punctuality window. |
| P | |
| P3 | Public-Private Partnership: A long-term arrangement allocating project delivery, financing, operations, maintenance, or revenue responsibilities between a public authority and private participants. |
| PA | Public Address: An audio communication system used to deliver routine announcements, service information, and emergency instructions on vehicles and at facilities. |
| PAYG | Pay As You Go: A fare model that charges riders for travel as it occurs, often applying transfers, daily caps, or best-fare calculations automatically. |
| PCI DSS | Payment Card Industry Data Security Standard: Security requirements for organizations that store, process, or transmit payment-card data, including agencies operating bank-card fare systems. |
| PIDS | Passenger Information Display System: Electronic displays that provide arrival predictions, destinations, service status, wayfinding, and emergency messages at stops, stations, or onboard vehicles. |
| PM | Preventive Maintenance: Scheduled inspection and servicing intended to reduce failures, preserve asset condition, support warranty compliance, and improve reliability. |
| PMOC | Project Management Oversight Contractor: A specialist engaged by the United States federal transit regulator to assess the management, cost, schedule, risk, and technical status of major capital projects. |
| PMP | Project Management Plan: A document defining governance, controls, organization, scope, schedule, cost, quality, risk, procurement, and reporting arrangements for a capital project. |
| PMT | Passenger Miles Traveled: A service-output measure calculated by multiplying passenger trips by the distances traveled, reflecting total passenger movement rather than boardings alone. |
| POP | Proof of Payment: A fare-enforcement model allowing passengers to board without passing a controlled barrier, subject to inspection for valid payment evidence. |
| P&R | Park-and-Ride: A facility where passengers transfer from private vehicles, bicycles, or other modes to bus or rail services. |
| PTASP | Public Transportation Agency Safety Plan: A federally required United States plan documenting safety-management processes, responsibilities, performance targets, risk controls, and continuous-improvement practices. |
| PTC | Positive Train Control: A system designed to prevent specified train-to-train collisions, overspeed derailments, unauthorized incursions, and movement through improperly aligned switches. |
| PTSCTP | Public Transportation Safety Certification Training Program: A United States federal training framework for designated transit agency and state oversight personnel who perform safety-related responsibilities. |
| PVR | Peak Vehicle Requirement: The number of vehicles needed to operate the maximum scheduled service level, excluding spares and vehicles unavailable for service. |
| R | |
| RAISE | Rebuilding American Infrastructure with Sustainability and Equity: A competitive United States grant program supporting transportation projects with significant local or regional benefits, including eligible transit investments. |
| RAMS | Reliability, Availability, Maintainability, and Safety: An integrated engineering framework used to establish, verify, and manage system-performance requirements throughout the asset lifecycle. |
| RCM | Reliability-Centered Maintenance: A structured method for selecting maintenance tasks based on asset functions, failure modes, consequences, and cost-effective risk control. |
| RNG | Renewable Natural Gas: Pipeline-quality methane produced from organic waste sources and used by some compressed-natural-gas fleets to reduce lifecycle emissions. |
| ROD | Record of Decision: The formal federal environmental document identifying the selected project alternative, mitigation commitments, and basis for the decision. |
| ROW | Right-of-Way: Land or legal access reserved for transportation infrastructure, including rail lines, dedicated busways, stations, utilities, and supporting facilities. |
| RTA | Rail Transit Agency: In federal rail safety oversight, an entity operating a rail fixed-guideway public transportation system that is not regulated as a general railroad. |
| RTA | Regional Transit Authority: A public body organized to plan, fund, coordinate, or operate transportation services across multiple municipalities or a metropolitan region. |
| RTAP | Rural Transit Assistance Program: A United States program providing training, technical assistance, research, and support for rural and tribal transportation providers. |
| RTP | Regional Transportation Plan: A long-range plan setting regional mobility policies, investment priorities, forecasts, and strategies across transportation modes. |
| RTPI | Real-Time Passenger Information: Live information on arrivals, departures, disruptions, and vehicle locations delivered through signs, applications, websites, or announcements. |
| RWP | Roadway Worker Protection: Rules, procedures, training, and controls designed to protect employees and contractors working on or near active rail rights-of-way. |
| S | |
| SCADA | Supervisory Control and Data Acquisition: A system for remotely monitoring and controlling infrastructure such as traction power, ventilation, pumps, elevators, and other station or guideway equipment. |
| SGR | State of Good Repair: The condition in which capital assets can safely perform their intended functions within established performance and lifecycle parameters. |
| SIRI | Service Interface for Real Time Information: A European standard for exchanging real-time public transport data, including estimated timetables, vehicle monitoring, and service disruptions. |
| SMS | Safety Management System: A formal, organization-wide approach to safety policy, risk management, assurance, promotion, accountability, and continuous improvement. |
| SOC | State of Charge: The estimated percentage of usable energy remaining in a battery, critical to electric-bus dispatch, range management, and charging decisions. |
| SOH | State of Health: An estimate of a battery’s current capacity and performance relative to its original condition, used for maintenance and replacement planning. |
| SOV | Single-Occupancy Vehicle: A private vehicle carrying only its driver, often used as a baseline when assessing mode shift, congestion, emissions, and demand-management outcomes. |
| SRTP | Short-Range Transit Plan: A near- to medium-term plan defining service, fleet, financial, operating, and capital priorities for a transit organization. |
| SSGA | Small Starts Grant Agreement: A federal funding agreement for qualifying smaller transit capital projects within the United States Capital Investment Grants program. |
| SSMP | Safety and Security Management Plan: A capital-project plan defining how safety and security requirements, hazards, reviews, certification, and responsibilities will be managed. |
| SSO | State Safety Oversight: The United States regulatory framework under which states oversee the safety of rail fixed-guideway public transportation systems not regulated as general railroads. |
| SSOA | State Safety Oversight Agency: The state-designated body responsible for independent safety oversight, audits, investigations, and enforcement for covered rail transit systems. |
| STBG | Surface Transportation Block Grant Program: A flexible United States federal program that can fund eligible roadway, bridge, pedestrian, bicycle, and public transportation projects. |
| STIP | Statewide Transportation Improvement Program: A federally required, financially constrained schedule of transportation projects expected to receive federal funding within a state. |
| T | |
| TAM | Transit Asset Management: A strategic approach for managing vehicles, facilities, infrastructure, and systems to optimize performance, risk, cost, and lifecycle value. |
| TAMP | Transit Asset Management Plan: A documented framework covering asset inventories, condition assessments, performance targets, decision support, and prioritized investments. |
| TCRP | Transit Cooperative Research Program: A United States applied-research program producing reports, tools, syntheses, and guidance on public transportation policy and operations. |
| TDM | Transportation Demand Management: Policies and programs that influence travel behavior, timing, route, or mode to reduce congestion and increase use of efficient transportation options. |
| TDP | Transit Development Plan: A planning document that evaluates current services and establishes future operating, capital, fleet, financial, and service-development priorities. |
| TERM | Transit Economic Requirements Model: A federal analytical model used to estimate transit capital investment needs, asset conditions, and state-of-good-repair requirements. |
| TIFIA | Transportation Infrastructure Finance and Innovation Act: A United States program providing federal credit assistance for eligible large transportation projects, including certain transit investments. |
| TIP | Transportation Improvement Program: A metropolitan region’s short-term, financially constrained schedule of projects selected to receive federal transportation funding. |
| TOD | Transit-Oriented Development: Compact, mixed-use, walkable development concentrated around high-quality transit to increase accessibility, ridership, and efficient land use. |
| TPSS | Traction Power Substation: A facility that converts and distributes electrical power for rail traction systems and associated wayside infrastructure. |
| TRB | Transportation Research Board: A division of the United States National Academies that convenes transportation professionals and publishes research across transit planning, safety, operations, and policy. |
| TSA | Transportation Security Administration: The United States agency responsible for transportation security, including assessments, directives, training, and coordination affecting public transportation systems. |
| TSGP | Transit Security Grant Program: A United States federal grant program supporting eligible projects that protect public transportation systems against terrorism and other security threats. |
| TSI | Transportation Safety Institute: A United States Department of Transportation organization providing safety, security, and accident-investigation training for transportation professionals. |
| TSP | Transit Signal Priority: Traffic-signal strategies that extend green time, shorten red time, or otherwise favor approaching transit vehicles to improve travel time and reliability. |
| TTY | Teletypewriter: A text-based telecommunications device used to provide accessible customer communication for people who are deaf or hard of hearing. |
| TVM | Ticket Vending Machine: A self-service device used to sell, issue, reload, or validate tickets and other fare media at stations and stops. |
| U | |
| UITP | International Association of Public Transport (Union Internationale des Transports Publics): A global association representing public transport authorities, operators, suppliers, research organizations, and mobility stakeholders. |
| ULB | Useful Life Benchmark: The expected service-life threshold for a capital asset or asset class, used in federal transit asset-management planning and replacement analysis. |
| UPT | Unlinked Passenger Trips: A ridership measure counting each vehicle boarding as a separate trip, so a journey involving a transfer produces multiple boardings. |
| USDOT | United States Department of Transportation: The federal department overseeing national transportation policy, funding, safety, research, and modal administrations. |
| UTO | Unattended Train Operation: The highest level of train automation, in which normal operation occurs without onboard operating staff responsible for driving or intervention. |
| UZA | Urbanized Area: A census-defined geographic area used in the United States to determine planning responsibilities, funding apportionments, and reporting classifications. |
| V | |
| VMT | Vehicle Miles Traveled: The total distance traveled by vehicles over a specified period, used in operating, environmental, safety, and travel-demand analysis. |
| VOMS | Vehicles Operated in Maximum Service: The number of revenue vehicles required to deliver the highest scheduled service level, as reported for federal transit statistics. |
| VRH | Vehicle Revenue Hours: The hours that vehicles operate in revenue service and are available to carry passengers, excluding deadhead and most non-revenue time. |
| VRM | Vehicle Revenue Miles: The miles traveled while vehicles are in revenue service and available to carry passengers, excluding deadhead and other non-revenue movement. |
| W | |
| WCAG | Web Content Accessibility Guidelines: International recommendations for making websites and digital services perceivable, operable, understandable, and robust for users with disabilities. |
| Z | |
| ZEB | Zero-Emission Bus: A bus producing no tailpipe emissions during operation, principally including battery-electric and hydrogen fuel-cell vehicles. |
| ZEV | Zero-Emission Vehicle: A vehicle category defined by the absence of direct exhaust emissions, used in fleet-transition policies, mandates, grants, and procurement plans. |