ITE Journal - March 2020 - 48

ATSPMs are critical in helping with citizen concerns as they
relate to traffic signals not operating in a more efficient manner.
Typically, addressing a traffic signal problem, making changes,
and calibrating the change can take days or weeks. With ATSPM,
LCDOT can make more complicated changes in three to five hours
and more simple changes in less than one hour, decreasing the need
to spend time on other calibration techniques, like simulation. For
example, a call came in from the public regarding the operation of
the traffic signal at Illinois Route 176 and Hawley St, which is part
of an adaptive signal system. The motorist stated that the traffic
signal was cycling too fast, causing backups on Illinois Route 176.
Utilizing the Split Monitor Report in the ATSPM, shorter than
expected green times for Illinois Route 176 were found. In looking
at the adaptive program, a gap between the coordinated tunnels
(green bands) was observed allowing enough time to double serve
Hawley St. The backups along Illinois Route 176 were confirmed
with closed circuit television (CCTV) cameras in the TMC. The
solution was to close the gap to prevent the traffic signal from
double serving Hawley St., but only when Illinois Route 176 was

busiest. After implementation, the ATSPM showed longer green
times for Illinois Route 176 and the CCTV cameras confirmed the
backups were gone. With ATSPM, the problem was identified, and
a solution was implemented in less than 30 minutes. ATSPM has
helped with new innovative traffic signal timing innovations, as
it provides a mechanism for studying the change in a much more
efficient manner.

Adaptive Traffic Signal Operation
The LCDOT ATSPM program is being used for continued
evaluation of adaptive traffic signal operation. Most agencies will
select an adaptive traffic signal program and expect that it will not
need to be changed, or minimally changed in the future. LCDOT
sees the need for ATSPM in consistently evaluating adaptive routes
in the most efficient way possible based on changing goals and
objectives. An approach was created to utilize ATSPM on routes
even when the adaptive technology intercepts vehicle detection
calls. Through this approach, LCDOT has been able to calibrate and
fine-tune its adaptive routes based on citizen concerns and conduct

Figure 6. Purdue Link Pivot showing coordination offset recommendations for optimal AoG. The route is Saunders Road from Deerfield road
to Discover Way in Riverwoods, IL, USA.
48

Ma rch 2020

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ITE Journal - March 2020

Table of Contents for the Digital Edition of ITE Journal - March 2020

ITE Journal - March 2020 - 1
ITE Journal - March 2020 - 2
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https://www.nxtbook.com/ygsreprints/ITE/ITE_May2020
https://www.nxtbook.com/ygsreprints/ITE/ITE_April2020
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
https://www.nxtbook.com/ygsreprints/ITE/G110109_ITE_September2019
https://www.nxtbook.com/ygsreprints/ITE/G108559_ITE_August2019
https://www.nxtbook.com/ygsreprints/ITE/G108250_ITE_July2019
https://www.nxtbook.com/ygsreprints/ITE/G107225_ITE_June2019
https://www.nxtbook.com/ygsreprints/ITE/G104039_ITE_May2019
https://www.nxtbook.com/ygsreprints/ITE/G104038_ITE_April2019
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
https://www.nxtbook.com/ygsreprints/ITE/G97366_ITE_August2018
https://www.nxtbook.com/ygsreprints/ITE/G96287_ITE_July2018
https://www.nxtbook.com/ygsreprints/ITE/G94315_ITE_June2018
https://www.nxtbook.com/ygsreprints/ITE/G93877_ITE_May2018
https://www.nxtbook.com/ygsreprints/ITE/G93065_ITE_Apr2018
https://www.nxtbook.com/ygsreprints/ITE/G91484_ITE_Mar2018
https://www.nxtbook.com/ygsreprints/ITE/G89434_ITE_Feb2018
https://www.nxtbook.com/ygsreprints/ITE/G86608_ITE_Jan2018
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