ITE Journal - March 2020 - 45

network, including a fiber optic network consisting of more than
300 (483 km) miles of fiber cable, licensed wireless radio communication, and cellular connections. The expansive communication
network connects more than 600 of the approximately 750 state,
county, and locally owned traffic signals in Lake County.
The ATSPM program started with utilizing the available
open-sourced ATSPM software developed by the Utah
Department of Transportation that provided a framework
for public agencies to implement the research that went into
ATSPMs.3 For testing purposes, a "retired" server that previously
held the central traffic signal system software was utilized, the
open-sourced ATSPM software was implemented, and the code
was modified in-house to be applicable to LCDOT.
Once the value of the program was proven (see "Results
and Success of the Program"), a wider implementation and

upgrade to the open-sourced ATSPM software version 4.2 was
funded along with controller firmware upgrades of 116 traffic
signals to be ATSPM ready. To date, 250 traffic signals currently
collect ATSPM data, including the addition of 47 more traffic
signals at the end of 2019 due to a project to update traffic signal
controller technology.
To obtain more accurate benefits of the technology, LCDOT
created a new lane-by-lane detection approach. The new detection
scheme also utilized speed detection for higher accuracy vehicle
counts and a lower rate of detection being stuck on. Figure 1
shows the old detection approach and Figure 2 shows the new
detection approach, which also includes special count detectors for
intersection movement counts. Figures 3 and 4 show the potential
difference in the number of vehicles being detected approaching the
traffic signal (symbolized by the black dots).

Figure. 1. Old detection approach (Autoscope video detection). The intersection is Washington Street and Cemetery Road in Gurnee, IL, USA.

Figure 2. New detection approach (Autoscope video detection). The intersection is Washington Street and Cemetery Road in Gurnee, IL, USA.

Figure 3. Purdue Coordination Diagram (PCD) with old detection approach. The intersection is Lewis Avenue and Sunset Avenue in Waukegan, IL, USA.
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ITE Journal - March 2020

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https://www.nxtbook.com/ygsreprints/ITE/ITE_March2020
https://www.nxtbook.com/ygsreprints/ITE/ITE_February2020
https://www.nxtbook.com/ygsreprints/ITE/ITE_January2020
https://www.nxtbook.com/ygsreprints/ITE/ITE_December2019
https://www.nxtbook.com/ygsreprints/ITE/G110939_ITE_November2019
https://www.nxtbook.com/ygsreprints/ITE/G110110_ITE_October2019
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https://www.nxtbook.com/ygsreprints/ITE/G104036_ITE_March2019
https://www.nxtbook.com/ygsreprints/ITE/G103582_ITE_February2019
https://www.nxtbook.com/ygsreprints/ITE/G102868_ITE_January2019
https://www.nxtbook.com/ygsreprints/ITE/G100155_ITE_December2018
https://www.nxtbook.com/ygsreprints/ITE/G100154_ITE_November2018
https://www.nxtbook.com/ygsreprints/ITE/G99495_ITE_October2018
https://www.nxtbook.com/ygsreprints/ITE/G98028_ITE_September2018
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