Evaluating the Relative Safety of Access Management Treatments in Micro-Simulation

This paper summarizes the findings of research sponsored by the Southwest Region University Transportation Center (SWUTC) to identify and quantify appropriate operational and safety performance measures that can be used for investigating access management treatments. Specifically, the research had three objectives: 1) assess the state-of-the-practice relative to performance measures that are applicable to access management roadway improvements and identify existing and/or new measures—particularly measures that can capture the safety benefits of access management treatments, 2) perform micro-simulation using the identified measures on two selected case study corridors and on three theoretical corridors to demonstrate the application of the measures, and 3) develop guidance for applying the performance measures for evaluating roadway improvements that include access management treatments (e.g., raised medians, driveway consolidation). This paper will be useful to practitioners as it identifies desirable input and output characteristics for individuals selecting a micro-simulation tool to use for assessing the impacts of access management treatments. It also identifies surrogate safety measures related to time-to-collision (TTC), and incorporates them into a micro-simulation model (VISSIM) as a demonstration of how both safety and operational impacts might be investigated in the same software package. Generally, the results appear intuitive—particularly at lower volumes and for the theoretical corridors. The paper also cautions that corridor improvements are very case specific and emphasizes how micro-simulation, when calibrated appropriately to field conditions, provides a useful tool to estimate the effects of combined corridor characteristics (operational and safety). Finally, the paper concludes with future research needs that can enhance the state-of-the-practice in this area.


  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References; Tables;
  • Pagination: 15p
  • Monograph Title: Tools of the Trade: 10th National Conference on Transportation Planning for Small and Medium-Sized Communities

Subject/Index Terms

Filing Info

  • Accession Number: 01044630
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Mar 23 2007 10:34AM