Traffic Data Collection & Signal Optimization

Lochmueller Group prepared two corridor studies that included extensive traffic data collection and signal optimization services for two state highways in St. Louis County encompassing 9.7 miles with 25 operating signals.

This project was to provide Missouri Department of Transportation (MoDOT) with signal timing parameters that could be used to enhance progressive traffic movement through the corridor and allow for the optimization of individual intersections. These parameters were developed from arterial progression analyses using Synchro software and implemented in the field to evaluate their effectiveness.

The project included turning movement count collection using JAMAR electronic count boards at all 29 intersections for a total of 48 hours at each location as well as directional mechanical tube counts for a period of one week at eight key locations along the arterial roadways to collect volume and classification data. Before and after travel time measurements were also collected using GPS devices and PC-Travel software.

The implementation of the new traffic signal timings resulted in substantial reduction in travel time through the corridor, which then also cuts fuel usage and emissions.

The project was federally funded through the CMAQ program under MoDOT’s supervision.

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