Boyles, Stephen D. et al.
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Research from the Center for Transportation research at the University of Texas at Austin focused on developing tools for evaluating the effectiveness of Active Traffic Management (ATM) strategies for freeway corridors. The research team performed a detailed microsimulation analysis for four ATM strategies under cases of recurring and non-recurring congestion. Ramp metering, variable speed limits, and hard shoulder running are found effective on the Williamson County test network on the outskirts of Austin, Texas.


In this study, the team chose to use the VISSIM micro-simulator developed by PTV. Performance of traffic flow on a freeway corridor was measured with the following metrics:

  • Travel time
  • Travel time reliability
  • Traffic speed
  • Queuing delay
  • Throughput

To measure these metrics from simulation, the research team used the built-in evaluation functions in VISSIM. To perform microsimulation analysis of the ATM strategies, the Williamson County testbed was used. The team selected a segment of I-35 SB for implementing ATM strategies. Frontage roads parallel to the I-35 corridor were also included. The total length of this corridor is 3.7 miles. The perpendicular arterials were also included at the three interchanges.

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John Hicks
Priority Research Area
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Texas DOT
Result Type
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A Planning Tool for Active Traffic Management Combining Microsimulation and Dynamic Traffic Assignment
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