Statewide Screening of Signalized Intersections

Approximately 2300 signalized intersections (Figure 1) were analyzed using Purdue Connected Vehicle Signal Analytics to screen all 8 movements, to determine if all 8 movements were operating satisfactorily (Figure 2a), or if any movement at an intersection had a split failures (Figure 2b). For

Figure 1: INDOT-managed signalized intersections (n: 2,309)

intersections that exhibited split failures on one or more movements, the intersections were classified by time of day as a) opportunities to improve operations through retiming or b) over capacity and candidates for capital investments. For intersections that were over capacity, a ranking metric using critical path split failing trajectory counts (SfnCP) was developed for prioritization. This metric was applied to over 2,300 INDOT-managed signalized intersections over a 17-month timespan to develop a prioritized list of intersections for more detailed engineering analysis to evaluate the cost effectiveness of capital investments in turn lanes or other geometrics to improve intersection operations.

Figure 2: Example Purdue Probe Diagrams for selected movements a selected intersections showing aggregated vehicle trajectories

For more information, see the full Technical Report:

Gayen, S., Saldivar-Carranza, E. D., Sakhare, R. S., Desai, J., Mathew, J. K., Shellhammer, N., Ruble, T., McCoy, D., Gallagher, J., & Bullock, D. M. (2024). Statewide screening of signalized intersections for capacity improvements (Joint Transportation Research Program Publication No. FHWA/IN/JTRP-2024/20). West Lafayette, IN: Purdue University. https://doi.org/10.5703/1288284317755