Freight Travel Time Reliability: On-Time Arrival

Truck travel times vary greatly from day to day, and drivers remember those few bad days they suffered through unexpected delays. Travel time reliability measures the extent of this unexpected delay. On-time arrival measure provides an estimate of how many times a truck driver is anticipated to arrive at the destination on time. Areas with the heaviest congestion on Florida's freeways are susceptible to unreliable travel times.

In 2019, daily truck travel time reliability on-time arrival improved statewide over 2018 numbers. Non-urbanized areas and urbanized areas outside the seven largest MPOs improved by over two percentage points. However, the urbanized areas of the seven largest MPOs saw a decrease of 0.9 percentage points during peak hour. Statewide, peak hour truck travel time reliability on-time arrival remained at 2018 levels, decreasing by only 0.1 percentage point.

Methodology

Methodology: Freight Travel Time Reliability: On-Time Arrival

On-Time Arrival is the percent of combination truck miles traveled (CTMT) for which the travel speed is greater than or equal to 45 mph for freeways within 7 largest MPO urbanized areas, and greater than or equal to 5 mph below the posted speed limit for freeways in all other areas.

Calculation

The on-time arrival for urbanized areas of the 7 largest MPOs was computed using the following equation:

`(Σ ("CTMT at a Travel Speed" ≥45 "mph"))/(Σ " CTMT") x100`

The on-time arrival for all other areas was computed using the following equation:

`(Σ ("CTMT at a Travel Speed" ≥ "Speed Limit" - 5 "mph"))/(Σ " CTMT") x100`

Reporting Periods

  • Peak Hour
  • Peak Period
  • Daily
  • Yearly

Sources

FDOT - Traffic Characteristics Inventory
HERE Technologies - Travel Time Data