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Mid-America Transportation Center

NDOR Evaluation of NDOR's Advanced Warning System

Final Report
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Researchers

  • Principal Investigator: Laurence Rilett (lrilett2@unl.edu 402-472-1992)
  • Project Status
    Complete
    Sponsors & Partners
  • Nebraska Department of Roads
  • About this Project
    Brief Project Description & Background
    In Nebraska, the benefits of advanced warning signs at isolated intersections have been generally acknowledged by the traveling public and the staff of the Nebraska Department of Roads. However, there has not been a well-documented analysis of their effectiveness and under which conditions they are most effective. In addition, there are currently no standards on when these devices should be installed and more importantly when they should be removed because of changing demand. The project will identify the effectiveness of the current advanced warning devices in Nebraska in terms of safety and traffic operations efficiency. Using this information as input, a modeling system will be developed so that NDOR engineers can perform consistent, detailed analyses of when these systems should be implemented and when they should be removed (if operating conditions change).
    Research Objective
    The objective of this project is to identify the effectiveness of the current advanced warning devices in Nebraska in terms of safety and traffic operations efficiency and create a modeling system for NDOR engineers to perform analyses to make decisions regarding implementation or removal of advance warning systems.
    Potential Benefits
    This project will include the development of a modeling system that will help engineers perform detailed, consistent analysis in regards to when and where advance warning systems should be implemented; this will optimize distribution of NDOR’s resources by helping to ensure that advance warning signs are implemented where they will have the greatest safety benefits.
    Abstract
    The Nebraska Department of Roads (NDOR) was one of the first state transportation agencies to implement advanced warning signs at isolated intersections. These systems provide information (via a flashing signal head and warning sign) to drivers regarding whether they should be prepared to stop as they approach a traffic signal. The decision on whether to provide information to the drivers is a function of a number of parameters including the presence of vehicles on the roadway (identified via an upstream detector), the phase sequence, and where the current signal timing plan is operating. A number of states have adopted similar systems - however the operating algorithm is unique to Nebraska. While the benefits of these devices have been generally acknowledged by the traveling public and NDOR staff there has not been a well-documented analysis of their effectiveness and under which conditions they are most effective. In addition, there are currently no standards on when these devices should be installed and more importantly when they should be removed because of changing demand. The project will identify the effectiveness of the current advanced warning devices in Nebraska in terms of safety and traffic operations efficiency. Using this information as input a modeling system will be developed so that NDOR engineers can perform consistent, detailed analyses of when these systems should be implemented and when they should be removed (if operating conditions change).
    Project Amount
    $ 92,549