Travel Time Reliability Data regarding Travel Time Index (TTI) and Buffer Time Index (BTI) as measures of effectiveness and reliability was collected for the I-4 Corridor. TTI is defined as a measure of average conditions and average travel times. BTI is defined as the amount of extra “buffer” time need to be on-time 95% of the time. Data was collected using Iteris Clearguide in February 2021. For the TTI, data references the time period of 3/18/2019 - 3/22/2019; Tuesday, Wednesday, Thursday only; granularity of 15 minutes; AM Peak of 7 AM - 9 AM; PM Peak of 4 PM - 6 PM. For the BTI, data references the time period of 1/1/2019 - 12/31/2019; Tuesday, Wednesday, Thursday only; granularity of 15 minutes; AM Peak of 7 AM - 9 AM; PM Peak of 4 PM - 6 PM. The number for each route is the average of the averages for that route. The morning TTI indicates slower travel times southbound on I-75 and Eastbound on CR 574 within the study area. The evening TTI indicates slower travel times southbound on I-75, Eastbound on I-4 and US 92, and both direction on CR 574. The morning BTI shows normal conditions within the study area with the exceptions of westbound I-4 with a 50% buffer time. The evening BTI shows normal conditions except for Eastbound I-4 (100%) and both directions of I-75 (50%).
Figure 11: Evening BTI
Figure 10: Evening TTI
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