The combination truck cost of delay estimates the cost of delay experienced by the freight industry by: (1) calculating the average marginal cost of labor per hour; and (2) multiplying that by the number of hours of delay for combination trucks. The average marginal cost of labor per hour is obtained as the sum of marginal driver wages and driver benefits from the American Transportation Research Institute (ATRI) annual report titled An Analysis of the Operational Cost of Trucking. The number of hours of delay for combination trucks comes from the combination truck hours of delay measure.

• Area Type
  • Urbanized Area: An area with a population of at least 50,000 people.
  • Non-Urbanized Area: An area with a population less than 50,000 people.
• Average marginal cost of labor per hour: The sum of marginal driver wages and driver benefits of combination truck drivers.
• Combination Trucks: Vehicles classified as Classes 8-13 by Federal Highway Administration; commonly referred to as a “semi-truck.”
• Combination Truck Cost of Delay: The cost of delay experienced by combination truck operators.
• Combination Truck Factor: The proportion of heavy vehicles that are combination trucks (FHWA Vehicle Classes 8-13) to all vehicles.
• Combination Truck Hours of Delay: Additional travel time experienced by a combination truck beyond the expected travel time in uncongested conditions.
• Context Classification: A classification assigned to a roadway that broadly identifies the various built environments in Florida, based on existing or future land use characteristics, development patterns, and the roadway connectivity of an area. For more information about context class, please reference the methodology report.
• Facility Type
  • Arterials: Signalized roadways that primarily serve through traffic, with intersections spaced two miles or less apart.
  • Highways: High-speed roadways with signalized intersections spaced more than two miles apart.
  • Freeways: Multilane, divided highways with at least two lanes for exclusive use of traffic in each direction and full control of ingress and egress.
• Highway System: An integrated network of roads and highways for motor and non-motor transport. Multiple highway systems exist in Florida, with the following three maintained by the State of Florida with a little distinction:
  • National Highway System (NHS): Roads designated by Congress as nationally important for inter-regional travel, including roads designated as connectors to NHS intermodal facilities, which are part of the State Highway System, and other NHS facilities.
  • State Highway System (SHS) - Roads under the jurisdiction of the State of Florida and maintained by the Florida Department of Transportation or a regional transportation commission; includes roads with Interstate, US, and SR numbers.
  • Strategic Intermodal System (SIS) - A statewide network of high-priority transportation facilities, including the state's largest and most significant airports, spaceports, deepwater seaports, freight rail terminals, passenger rail and intercity bus terminals, rail corridors, waterways, and highways. The FDOT Source Book reports roadway SIS facilities on the SHS or the NHS.
• Reporting Period
  • Yearly: Includes all the calendar days in a year.
• Segment: A portion of roadway defined by two boundary points.