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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Statewide 'Daily Person Hours of Delay' on SIS
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Source: FDOT, Florida Highway Data Source Book
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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.


Strategic Intermodal System (SIS) consists of following road networks: interstates, the Turnpike Enterprise, freeways, and other high speed, high volume roadways.


The FIHS consists of about 1.7 percent of total centerline miles on Florida’s road network but it carried about 24 percent of total daily vehicle miles traveled in 2006.


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 SIS 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

This indicator shows the total statewide daily person hours of delay on Strategic Intermodal System (SIS) in thousands (K). The SIS consists of interstates, the Turnpike Enterprise, freeways, and other high speed, high volume roadways. The source for this indicator is the Florida Department of Trasportation's Florida Highway Data Source Book.

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