ITE Journal - March 2020 - 47

a.	
b.	
c.	
d.	
e.	
f.	

Change in delay
Change in fuel consumed
Annual change in CO2
Annual benefit
Change in travel time
Change in average speed

Finally, the RFP included collaboration language for expansion
of the ATSPM solution to all the collar counties of the Chicago
metropolitan area, in which the other jurisdictions can add their
traffic signals at the bulk rate and customized to a per month
charging basis with no long-term commitment. LCDOT incorporated comments on the RFP from Kane County, DuPage County,
City of Naperville, Federal Highway Administration (FHWA), and
the Chicago Metropolitan Agency for Planning.

Results and Success of the Program
Through coordination and cooperation at many levels from IDOT
to local municipalities, the Lake County ATSPM Program has
enabled many industry-leading and cost-effective solutions. This
project provided the following benefits:

Improved Traffic Signal Operation
LCDOT typically consults out Signal Coordination and Timing
(SCAT) studies, in which:
1.	 Turning movement counts are collected;
2.	 A Synchro traffic signal analysis is conducted;
3.	 Traffic signal cycle lengths, splits, and offsets are optimized;
4.	 A before and after travel time study is conducted; and
5.	 A benefit to cost analysis is done.

ATSPMs have allowed LCDOT to better review performance of
these optimized signal systems. Reports such as Arrival on Green
(AoG) have shown a flaw in the SCAT process in which arrival on
green was not optimized as well as it could have been. Most signal
systems are analyzed using a start-to-end methodology that does
not properly factor internal traffic that does not go the entire system.
A good example is the PM Peak traffic impacts from Discover
Financial, which is a Fortune 500 Company with their headquarters in Riverwoods, IL, USA. At the traffic signal at Saunders Rd.
and Discover Way, there is a large amount of vehicles exiting the
Discover Financial headquarters, disrupting Saunders Rd. Figure 5
shows the low AoG for a downstream traffic signal at Deerfield Rd.
and Saunders Rd., along with the Purdue Link Pivot results (Figure
6) to improve the offset along the route to balance the company
exiting traffic with peak northbound Saunders Rd. traffic.
The result is an overall delay reduction for the entire route.
Utilizing ATSPM will be an LCDOT requirement through a
special provision update for SCAT studies to calibrate the signal
system based on at least three weeks of typical traffic conditions.

Quicker Response Time to Citizen Concerns
TMC operators can use ATSPMs to review traffic progression inconsistencies like Emergency Vehicle Preemption (EVP), pedestrian
movements that aren't able to fit into a coordinated split time, and
handling traffic signal operations during incidents to improve traffic
temporarily due to lane reductions or roadway closures. ATSPMs
give TMC operators quick access to data for phone calls and email
submissions, which gives an opportunity to educate citizens on how
traffic signals operate and the information that goes into making
decisions on how a specific traffic signal operates.

Figure 5. Purdue Coordination Diagram (PCD) with 37 percent AoG. The intersection is Saunders Road and Riverwoods Road in Riverwoods,
IL, USA.
w w w .i t e.or g

M a rch 2020

47


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