Are Dilemma Zone Protection Systems Useful on High Speed Arterials with Signal Coordination? A Case Study


This study assessed the potential deployment of Actuated Advance Warning (AAW) systems on arterials where traffic signals are closely spaced and operate in coordinated mode. Traffic microsimulation and surrogate safety analyses were used to assess the potential safety and operational benefits. The results indicated that, on average, there were 30%, 7% and 30% reductions in the number of rear-end, lane change and crossing conflicts when the AAW system was used. The relative productivity of the system – vehicles processed during a specified period revealed more throughput. These findings can be useful guidance to transportations agencies as they consider potential AAW deployments.

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The authors would like to thank the City of Lincoln, Nebraska and the Nebraska Department of Transportation (NDOT), formerly Nebraska Department of Roads (NDOR), for providing background information and network data. The contents of this paper reflect the views of the authors, who are responsible for the facts and the accuracy of the information presented herein, and are not necessarily representative of the City of Lincoln or NDOT.

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Correspondence to Bhaven Naik.

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Naik, B., Appiah, J. & Rilett, L.R. Are Dilemma Zone Protection Systems Useful on High Speed Arterials with Signal Coordination? A Case Study. Int. J. ITS Res. 18, 219–229 (2020).

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  • Dilemma zone
  • Advance warning
  • Coordination
  • High-speed arterials
  • Safety