Travel Time Reliability Implementation for the Freeway SIS

Four previous FDOT research projects on travel time reliability (FDOT Contracts BD-545-48, BD-545-70, BD-545-75, and BDK-77-977-02) developed and implemented models for predicting travel time reliability for freeways, using data from Philadelphia, PA, from Ft. Lauderdale, FL, and from Jacksonville, FL. The tools developed can provide travel time reliability as a function of various changes in the system, such as incident removal times, and work zone occurrences, as well as selected ITS programs and initiatives (such as the road rangers). These procedures have been implemented to estimate travel time reliability in Broward county, FL.

The objectives of this research are to a) implement the procedures developed on the entire freeway portion of the SIS, b) enhance the existing procedures to incorporate additional elements such as the impact of incidents on each freeway segment and the impacts of various ITS strategies, c) validate the estimates obtained using field data for those portions of the SIS where travel time information is available, and d) establish procedures for updating the travel time reliability estimates on an annual basis.