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Adaptive Traffic Control Systems: Domestic and Foreign State of Practice (2010) / Chapter Skim
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Pages 17-22

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From page 17...
... Each of the ATCS descriptions primarily follows a format with the following subsections: • Adaptive traffic control logic • Hardware and software requirements • System architecture and communications • Detection requirements • Special features. Detailed descriptions of all ATCSs and their characteristics were beyond the scope of this study.
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From page 18...
... Some of the major systems combine two concepts for various segments of their operations. For example, SCOOT determines splits and offsets proactively, whereas the cycle length is computed reactively.
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From page 19...
... However, there are a few ATCSs that do not follow this rule either because they are still under development (e.g., ACS Lite) or because their operations are not based on all of these timings (e.g., RHODES, InSync, and some versions of OPAC do not use cycle lengths)
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From page 20...
... Timings: S = splits; Cl = cycle length; O = offset; PS = phase sequencing. A TC S A CS L ite B A LA N CE In Sy nc LA A TC S M O TI O N O PA C R H O D ES SC A TS SC O O T U TO PI A Detection SL, MB/ US NSL NSL SL & US NSL MB & SL MB & SL SL, NSL, MB US & SL US & SL Action P & R P & R P & R P & R P & R P P R P & R P Adjustment DCO TCO DCO RA, TCO, DCO TCO TCO TCO RA DCO TCO Time Frame 5–10 min 5 min Phase/ Cycle/ 15 min Cycle 5–15 min Phase/ Cycle/ 5 min Sec by sec Cycle Cycle/ 5 min 3 sec -- Cycle Level C/L C/L C/L C/L C/L C/L C/L C/L C/L C/L Model No YesYes Yes Yes Yes Yes No YesYes Timings S, O S, Cl, O, PS S, Cl, O, PS S, Cl, O S, Cl, O, PS S, Cl, O S S, Cl, O S, Cl, O, PS S, PS Flexi Region No No YesYes No No Vehicle Actuated No YesYesYes Yes No No No TSP No YesYes Yes Yes Yes Yes Yes Yes Yes Yes Yes YesYesYes Yes TABLE 7 OPERATIONAL CATEGORIZATION OF ATCS
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From page 21...
... Supports all communications media; preference is fiber optic. LA ATCS Model 170 Controllers/ 172.3 Firmware Type 2070 Controllers/ City of LA Software Dedicated central to field connection 1200 bps using time division multiplexing 4 intersections/communication channel No Peer-to-Peer communication needed Supports multiple communication media InSync Existing Controllers Cabinets require InSync processor to communicate with controller using detector cards Internet access to InSync System through a local computer InSync System PC ATCS/Traf Graph Editor Ethernet communication ACS Lite Siemens NEMA (M50 series)
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From page 22...
... SCOOT algorithm and ACTRA Supports all communications media; wireless typically not used. UTOPIA Peek's EuroController with MDSL unit System Controller Software Communications Eagle NEMA Eagle 2070/ PC SCATS require a separate channel toWindows Server 2003 PBS with MS PC-based software Logic is distributed over control units.
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Key Terms

  • cycle length
  • acs lite
  • special features
  • traffic model
  • queue lengths

  • software requirements
  • local controller
  • objective function
  • control logic
  • traffic control

  • travel time
  • minimum green
  • travel times
  • traffic signal
  • control strategy

  • traffic demand
  • adaptive traffic
  • transit vehicles
  • control strategies
  • local controllers

  • controller software
  • signal timings
  • cycle lengths
  • queue length
  • intersection control

  • fiber optic
  • adaptive operations
  • upstream intersection
  • traffic conditions
  • current traffic


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