Geometric Elements and Wrong-Way Crashes at Partial Cloverleaf Interchange Terminals

This paper summarizes the existing applications of geometric elements that have been proposed to deter wrong-way movement at parclo interchange terminals. It analyzed the collected WWD crash and geometric design data to quantify the relationships between geometric elements and WWD at parclo interchange terminals. The most common conditions for WWD entries for each technique are stop line positionings on the crossroad more than 60 percent, turning radii larger than 100 ft, the traversable median,and medians 10 ft or less. The highest odds ratrio belongs to the stop line positioning on crossroads, indicating high importance of this factor. Turning radii larger than 80 ft from crossroads to two-way ramps are twice or more susceptible to WWD entries. Traversable medians are more prone to WWD entries. Median widths more than 40 ft between ramps are less vulnerable to WWD entries.This study establishes the foundation for countermeasure developments and design guide modifications to improve safety at parclo interchange terminals, including stop line positioning no more than 60 percent, turning radii less than 80 ft, using a non-traversable median, and median widths less than 40 ft. Although the methodology identified vulnerable geometric designs to WWD and validated the differences between geometric elements with field and crash data, it cannot determine what caused the differences of driver behavior.


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  • Accession Number: 01666556
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 11 2018 8:11AM