United States Department of Transportation
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Adding signals to coordinated traffic signal systems.
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1983-08-01
[PDF-2.88 MB]
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Abstract:The purpose of this research was to investigate the effect of adding or
removing traffic signals within a coordinated, signal-controlled street network.
The report includes a discussion of coordinated signal systems; arterial street
network configurations; optimization of signal settings for progressive movements;
simulation of traffic on street networks with specified off-peak vehicular volumes
and different intersection control strategies; and analyses of statistical data
resulting from the simulation of traffic on several representative street networks.
A signal timing optimization program, PASSER II, was used to determine the
signal timing patterns for each of twelve representative street networks that were
operated under different control strategies. The computer program called NETSIM
was then used to simulate traffic on the networks and produce statistics concerning
the relative effectiveness of the various control schemes o A total of 98 different
network cases were simulated by NETSIM. i J The best practicable estimate of the effects of altering the number of
signalized intersections in a network can be made by applying computer optimization
and simulation techniques directly to the spec1f1c before and after s1tuat10ns
under consideration. This requires the use of computers and experienced personnel.
Approximate methods for estimating these effects without using a computer are
described in this report.
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