Florida Department of Transportation - Forecasting and Trends Office Center for Urban Transportation Research

At this time this site is not being updated. More current data may be available for some measures. You may want to check back in the future. - August 18, 2017.

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Delay and Congestion



Traffic congestion and delay are characterized by slower speeds, longer trip times, and increased queuing. They are the indicators of traffic demand that is greater than the available capacity of the road network. These conditions are exacerbated by various land use and infrastructure investment decisions that do not promote the most efficient use of the transportation network


Daily person hours of delay is calculated by determining the difference between the estimated travel time under actual (often congested) conditions and under uncongested conditions, for each highway segment and each hour of the day. These hourly delays per vehicle are multiplied by the annual average hourly traffic for each hour, and summed to get total daily vehicle hours of delay. They can then be multiplied by the vehicle occupancy to get total person hours of delay.


The Strategic Intermodal System (SIS) is a statewide network of high-priority transportation facilities where focusing investments produces the greatest impact on commerce and economic competitiveness..


Of Florida's 12,116 centerline miles of State Highway System, 4,295 are designated as SIS. The SIS carries 56 percent of the daily vehicle miles traveled in 2014.


Congestion and Delay trends are shown on the website using the following indicators: statewide delay on SIS, delay on SIS in the 7 largest counties (Miami-Dade, Broward, Palm Beach, Hillsborough, Orange, Pinellas, Duval), and percentage of centerline miles congested on FIHS with change in population and lane miles.


The source of this data is the Florida Department of Transportation's (FDOT) Highway Data Source Book. The FDOT publishes this source book yearly. This indicator has a one year lag time. To learn more about these topics visit: http://www.dot.state.fl.us/planning/statistics/sourcebook


For further information on this topic contact:


Highway Statistics Manager

Transportation Statistics Office, Mail Station 27

Florida Department of Transportation

605 Suwannee Street

Tallahassee, Florida 32399-0450

Telephone: (850) 414-4730

Fax: (850) 414-4878


FDOT Trends on the Web