• AADT Annual Average Daily Traffic
  • ATRI American Transportation Research Institute
  • BEBR University of Florida’s Bureau of Economic and Business Research
  • BEV Battery Electric Vehicles
  • CRS Computerized Reservations Systems
  • CTMT Combination Truck Miles Traveled
  • CTTMT Combination Truck Ton Miles Traveled
  • DVMT Daily Vehicle Miles Traveled
  • FAF Freight Analysis Framework
  • FCEV Fuel Cell Electric Vehicles
  • FDOT Florida Department of Transportation
  • FHWA Federal Highway Administration
  • FSTED Florida Seaport Transportation and Economic Development Council
  • GDP Gross Domestic Product
  • HEV Hybrid Electric Vehicles
  • LOS Level of Service
  • MPH Miles per Hour
  • MPO Metropolitan Planning Organization
  • NHS National Highway System
  • NHTSA National Highway Traffic Safety Administration
  • NTD National Transit Database
  • PHEV Plug-in Hybrid Electric Vehicles
  • PMT Person Miles Traveled
  • PTI Planning Time Index
  • RCI Roadway Characteristics Inventory
  • SHS State Highway System
  • SIS Strategic Intermodal System
  • TCI Traffic Characteristics Inventory
  • TEU Twenty-foot Equivalent Unit
  • TMT Truck Miles Traveled
  • TNC Transportation Network Company
  • VMT Vehicle Miles Traveled
  • WIM Weigh In Motion


  • 95th Percentile Travel Time

    The travel time that is higher than 94% of travel time observations or equivalently lower than 4% of the average speed observations.

  • Annual Average Daily Traffic (AADT)

    The average daily traffic for an entire year, 24 hours per day, 7 days a week. AADT is determined using measurements at thousands of locations each year by FDOT.

  • Area Type

    Statewide, urbanized areas of the 7 largest MPOs, other urbanized areas, and non-urbanized areas for the purpose of the FDOT Source Book.

  • Arterials

    Signalized roadways that primarily serve through traffic with average signalized intersection spacing of 2.0 miles or fewer.

  • Auto (automobile)

    A highway travel mode that includes motor vehicle traffic including motorcycles, passenger cars, and four tire, single units (FHWA Vehicle Category Classification, Classes 1- 3).

  • Auto/Truck

    A combination of the auto and truck modes (FHWA Vehicle Category Classification Classes 1-13).

  • Average Weighted Speed

    Calculated as the average speed weighted by the hourly vehicle miles traveled.

  • Centerline Miles The total length of roads, without regard to number of lanes.
  • Combination Trucks

    A truck tractor pulling any number of trailers (including a “bobtail” truck tractor not pulling any trailers) or a straight truck pulling at least one trailer. These are vehicles classified as Classes 8-13 by FHWA.

  • Congestion

    Condition in which traffic demand causes the LOS to be at or below FDOT’s LOS target.

  • Connectors

    Highways, rail lines, or waterways linking hub-to-corridor, hub-to-hub, or strategic military installation-to-corridor.

  • Corridors

    Highway, rail line, waterway, and other exclusive-use facilities that connect major origin/destination markets within Florida or between Florida and other states/nations.

  • Daily VMT

    The product of a road’s length and its AADT. If a ten-mile long road has an AADT of 5,000 vehicles, then its daily VMT is 50,000.

  • Delay

    Added travel time for a vehicle along a given route above and beyond travel time on that route under uncongested operating conditions.

  • Empty Backhaul Tonnage

    Amount of empty available tonnage that could have been carried by a truck while on a return trip from destination.

  • Facility

    Roadway composed of points and segments, seaports, airports, spaceports, rail yards, or transit stations.

  • Fixed-Route Transit

    A system for transporting multiple people that uses one or more vehicles operating on a prescribed route according to a fixed schedule. This term does not describe fixed-route air travel, ferries, or water taxis.

  • Free-Flow Travel Time

    The average time spent by vehicles not under the influence of speed reduction conditions over a facility length.

  • Freeway

    A multilane, divided highway with at least two lanes for exclusive use of traffic in each direction and full control of ingress and egress

  • Freight

    Bulk goods transported by truck, train, ship, aircraft, or spacecraft.

  • Heavily Congested

    Arterial segments operating at LOS E or worse in urbanized areas and D or worse in non-urbanized areas; highways operating at LOS E or worse; and freeways operating at 45 mph or worse

  • Highways

    High speed roadways with signal spacing greater than two miles per signal.

  • Lane Miles

    The product of the centerline miles and the number of lanes. A four-lane road that is 10 miles long has 40 lane miles.

  • Level of Service

    A quantitative stratification of the quality of service to a typical traveler of a service or facility into six letters, with “A” describing the highest quality and “F” describing the lowest quality.

  • Mobility Performance Measure

    A metric that quantitatively describes something about the movement of people or goods.

  • National Highway System (NHS)

    The Interstate Highway System as well as other roads important to the nation’s economy, defense, and mobility. A roadway on the NHS may not be on the SHS.

  • Passengers

    Aviation – The total number of revenue passengers boarding aircraft, which includes only passengers boarding at a Florida airport. If a passenger has to transfer between planes to reach a destination, the passenger is counted as making two passenger boardings.

    Transit – The total number of passenger trips on transit vehicles. A trip is counted each time a passenger boards a transit vehicle. Thus, if a passenger has to transfer between buses to reach a destination, the passenger is counted as making two passenger trips. Seaport – The total number of passenger movements at Florida’s eight cruise ports.

    Rail – The total number of revenue paying rail passengers for SunRail, Amtrak, and Tri-Rail.

  • Reporting Periods

    Peak Hour – 5:00 p.m.-6:00 p.m. on a weekday. This hour is chosen to allow consistent comparisons among transportation modes. It may not be the hour of greatest travel for any given roadway or mode.

    Peak Period – A multi-hour period (4:00 p.m.-6:00 p.m.) in which travel is greatest. These peak period hours are chosen based on the hours of greatest travel in different area types.

    Daily – For the average 24-hour day.

    Yearly – Includes all the calendar days in a year, excluding holidays and weekends.

  • Seven (7) Largest Metropolitan Planning Organizations (MPOs):

    The urbanized geographic areas with a population of at least 500,000 people covered by Florida’s seven most populous MPOs: Broward MPO, Forward Pinellas, Hillsborough MPO, MetroPlan Orlando, Miami-Dade TPO, North Florida TPO, and Palm Beach TPA.

  • Shared-Use Paths

    A shared-use path, also referred to as a multiuse trail, is typically 12 feet wide, but may commonly vary from 10 feet to 14 or more feet depending upon constraints or volume of use. It is differentiated from a sidewalk in that it is generally wider, is part of a larger regional and statewide systems of trails, and is accompanied by a higher level of facilities including trailheads, parking, wayside areas and other amenities.

  • Speed

    Velocity in miles per hour. The daily average speed is the average for travel 24 hours of the day. The peak hour speed is the average speed from 5:00 p.m.-6:00 p.m.

  • State Highway System (SHS)

    All roadways maintained and operated by the FDOT.

  • Strategic Intermodal System (SIS)

    Florida’s transportation system composed of facilities and services of statewide and interregional significance, including appropriate components of all modes. A roadway on the SIS may not be on the SHS.

  • Transit

    A travel mode in which vehicles (including buses, streetcars, and street-running light rail) pick up and drop off passengers at regular stops/stations.

  • Travel Time Reliability

    On-Time Arrival – For the seven largest MPOs, on-time arrival is defined as the percentage of freeway trips traveling at least 45 mph. For all others, on-time arrival is defined as the percentage of freeway trips traveling at greater than or equal to 5 mph below the posted speed limit. For example, 80% on-time arrival indicates the traveler is anticipated to arrive at the destination on time in 4 out of 5 trips.

    Planning Time Index – Planning Time Index is the ratio of 95th percentile travel time to the free-flow travel time. This measure represents the additional time that a traveler should budget to ensure on-time arrival 95 percent of the time.

  • Trucks

    Vehicles classified as Classes 4-13 by FHWA.

  • Twenty-Foot Equivalent Unit

    The standard measure used for containerized cargo. One Twenty-Foot Equivalent Unit includes an 8-foot by 8-foot by 20-foot intermodal container.

  • Urban

    An area with a population of at least 5,000 people.

  • Urbanized Area

    An area with a population of at least 50,000 people.

  • Vehicle Occupancy

    The average number of persons in a vehicle, using a countywide average from the National Household Travel Survey conducted in 2009.

  • Volume

    The number of vehicles crossing a section of road during a specified time period.

  • E-scooter

    A vehicle made up of a narrow footboard on wheels with an upright steering handle, ridden while standing, and propelled by a combination of human power and an electric motor.

  • Gross Domestic Product (GDP):

    The total market value of the goods and services produced within Florida or the United States in a year.

  • Micromobility

    All shared-use fleets of small, fully or partially human-powered vehicles such as bikes, e-bikes and e-scooters.

  • Non-employer Establishment

    Non-employer establishments for taxi and limousine services are establishments without paid employees in the Transportation and Warehousing sector that pay federal income tax.

  • Serious Injury

    Disabling/incapacitating injuries from traffic crashes that prevent the injured individuals from pursuing normal activities and require hospitalization.

  • Seven Largest Counties

    Broward, Duval, Hillsborough, Miami-Dade, Palm Beach, Pinellas, and Orange.