PTP key terms

The designated regional body that conducts federally required transportation planning for an urbanized area and approves plans and programs used to access federal funds.

The federal requirement that metropolitan transportation planning be continuing, cooperative, and comprehensive across jurisdictions and modes. It shapes how MPOs organize data, set policy, and coordinate decisions.

A document describing how an agency will inform and involve the public in transportation planning, including outreach methods, timelines, and how comments affect decisions.

A policy principle ensuring transportation plans and projects do not disproportionately burden low-income and minority populations and that those groups receive fair access to benefits and decision-making.

The federal law requiring environmental review of major transportation actions, including analysis of impacts and alternatives before a project can receive federal approval or funding.

A long-range regional plan, typically covering at least 20 years, that sets transportation goals, forecasts needs, and lists strategies and projects for an MPO area.

A short-range, fiscally constrained list of transportation projects an MPO intends to fund and implement, usually covering four years and updated regularly.

A statewide list of transportation projects programmed for federal funding over several years, built from MPO TIPs and state priorities.

The requirement that a transportation plan or program include only projects for which reasonable funding is expected to be available, preventing unrealistic project lists.

The process showing that a transportation plan and program will not worsen air quality beyond limits in regions with poor air quality, required before federal approval.

A systematic approach in metropolitan areas to monitor congestion, identify causes, and select strategies that manage travel demand and operations before adding capacity.

A road design approach intended to make streets safe and usable for all travelers, including pedestrians, bicyclists, transit riders, motorists, and people with disabilities.

A safety strategy aiming to eliminate traffic deaths and serious injuries by accepting that crashes are preventable and by designing systems that reduce crash severity.

Compact, mixed-use development near transit stations designed to encourage walking, transit use, and reduced car dependence. It typically includes higher density, pedestrian-friendly streets, and a mix of housing, jobs, and services.

Strategies that reduce or shift motor vehicle travel, such as vanpools, telework, transit subsidies, parking pricing, and bicycle programs, rather than adding road capacity.

A street reconfiguration that typically reduces motor vehicle lanes and reallocates space to other uses such as turn lanes, bike lanes, sidewalks, or parking.

A planning approach that sets measurable targets and uses performance data to choose strategies, allocate funds, and monitor results.

A mathematical tool that estimates how land use, population, employment, and transportation networks affect travel patterns and volumes under different scenarios.

A traditional modeling sequence that estimates trip generation, trip distribution, mode choice, and traffic assignment to forecast travel on a network.

The modeling step that estimates how many trips originate from or end at households, businesses, or other land uses based on characteristics such as size and income.

The modeling step that links trip origins and destinations, often using a gravity model, to estimate where trips go within a study area.

The modeling step that estimates the share of trips made by car, transit, walking, bicycling, or other modes based on cost, time, convenience, and traveler characteristics.

The modeling step that assigns estimated trips to the road network and predicts traffic volumes, travel times, and congestion on specific links.

A travel model that simulates individuals' daily activity schedules and travel choices rather than estimating aggregate trip totals from land-use data alone.

A data collection effort that records where travelers start and end trips, often using roadside interviews, license plate matching, or GPS data.

A survey of residents' daily travel, including trips, modes, purposes, and times, used to calibrate travel demand models and understand behavior.

A field measurement of vehicle volumes on a road or intersection, often classified by time, direction, or vehicle type, used for planning and model validation.

An imaginary line across a corridor or area where counts are summed to check whether modeled or observed traffic crossing the line is consistent.

A letter grade from A to F describing operating conditions for a transportation facility, based on measures such as delay, speed, or density.

The ratio of traffic demand to a facility's maximum capacity; values near or above one indicate congested or oversaturated conditions.

Additional vehicle travel that occurs when new road capacity lowers travel times and attracts trips that were previously suppressed, shifted, or made elsewhere.

A planning method that compares alternative future conditions, such as different land-use or investment patterns, to test how policies perform under uncertainty.

A quantitative indicator used to track progress toward transportation goals, such as crash rates, travel-time reliability, transit ridership, or pavement condition.

A method that compares the monetary value of a project's expected benefits, such as time savings and safety gains, with its costs.

A process for ranking candidate transportation projects using criteria such as safety, congestion, cost-effectiveness, equity, and readiness to select which receive funding.

A systematic approach to maintaining transportation infrastructure by tracking condition, setting maintenance priorities, and minimizing life-cycle costs.

A charge for driving on congested roads or into busy areas during peak periods, intended to reduce traffic and fund transportation improvements.

Technologies that manage and improve transportation operations, such as traffic signal coordination, traveler information, tolling systems, and incident detection.

The federal program that provides funding to states and MPOs for highway and bridge projects, subject to planning, environmental, and fiscal requirements.