Vehicle Miles Traveled

Vehicle miles traveled (VMT) measures the amount of travel for all vehicles in a geographic region over a given period of time. VMT is calculated by adding up all the miles driven by all the cars and trucks on all the roadways in a region. This metric plays an integral role in the transportation planning, policy-making, and revenue estimation processes due to its ability to indicate travel demand and behavior.

Travel on Florida’s State Highway System (SHS) has been steadily increasing since 2014. Between 2014 and 2018, vehicle miles traveled on Florida’s SHS during the peak hour increased by 16.3%.

Methodology

Methodology: Vehicle Miles Traveled

Daily vehicle volume was directly obtained from annual average daily traffic (AADT), while the peak hour volume was the product of the AADT and the highest hourly factor. Vehicle miles traveled (VMT) was determined using vehicle traffic volume and segment length. The number of VMT was based on data obtained from traffic monitoring sites and Florida Department of Transportation’s (FDOT’s) Roadway Characteristics Inventory (RCI) Feature 111 data.

Calculation

`"VMT" = Σ ("Segment Length" × "Volume")`

Reporting Periods

  • Peak Hour
  • Peak Period
  • Daily
  • Yearly

Sources

FDOT - Traffic Characteristics Inventory
FDOT - Roadway Characteristics Inventory