Access Management Guidelines for Interchange Areas
Contracting Agency: FDOT Principal Investigator: Dr. Scott Washburn
Sometimes development occurs sofrequently and close to interchanges that they interfere with theefficient movement of traffic at the interchange. This intensity ofdevelopment leads to a lot of closely spaced driveways, and ifcombined with non-restrictive medians and signals, can lead to alarge number of traffic conflicts/interactions (including a largepercentage of left turns) in a small amount of space. This in turnoften leads to poor arterial operations, which can negatively impactinterchange ramp operations efficiency.
Furthermore, excessive queuing isgenerally a by-product of inefficient arterial operations. This canbecome a significant safety issue, particularly for interchangeoff-ramps. Queues that extend upstream to the freeway mainlinepresent a very hazardous situation. Additionally, excessive queuesat driveway locations will promote riskier gap acceptance behaviorby motorists.
The objective of this research is todevelop more comprehensive quantitative and objective basedguidelines for the location of driveways, signals, and medianconfigurations in the vicinity of interchanges. The generalresearch methodology will consist of a combination of field data andsimulation modeling, with the expected product being a set ofanalytical equations for use in predicting desired performancemeasures based on typical traffic, roadway, and control inputvariables.
Transportation Research Center Lily Elefteriadou, Ph.D., TRC Director
University of Florida Civil & Coastal Engineering
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