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District 1 Left Turn Phasing Changes Candidates - A custom python toolbox developed by JMT is used in ArcGIS Pro to determine candidate locations for application of protected only and protected-permissive left turn phasing for signalized intersections in District 1.

An assessment of left turn phasing and the impacts to safety is performed for all signalized intersections. First, the signalized intersection points are classified with the current left turn phasing as protected only, protected-permissive with a 5-section head, protected-permissive with a 4-section head, permissive only, or split phase based on the existing signal head information. Next, the number of left turn, pedestrian, and bicycle crashes are assigned to the signalized intersection. The widest crossing distance at the intersection is estimated from available sources (FDOT Number of Lanes and Auxiliary Lanes). The current left turn phasing, crossing distance and number of crashes are used to assess the eligibility of the signalized intersection for application of protected only or protected-permissive left turn phasing. 

The countermeasure analysis result layers and JMT-managed source data layers are to be updated by JMT only upon request of District 1 stakeholders.  Source datasets for this analysis include District 1 Signalized Intersections (produced by JMT with data provided by District 1), District 1 Auxiliary Lanes (provided by FDOT), FDOT Number of Lanes, and Crash Data from 2015-2019.  Note that the FDOT-managed source data used in the analyses was downloaded from FDOT's TDA website in file geodatabase format by JMT in May 2022; thus the currently displayed FDOT-managed reference layers may be out of sync with the analysis source data.  

Contact:  JMT Technology Group: Mallory Gill, mgill@jmttg.com, (757-552-1099)

Published May 2022