Access Management in the Vicinity of Interchanges, Volume 1: Practitioner’s Guide (2022) / Chapter Skim
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Pages 36-44
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From page 36... ...
36 Assessment Methodology The previous chapters identified individual interchange forms as well as corridor characteristics commonly associated with crossroads located in the vicinity of the interchanges. Though it is important to understand how each of these individual features may influence corridor operations and safety, it is also helpful to assess the combined effect of corridor characteristics.
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From page 37... ...
Assessment Methodology 37 In addition to the influence of the right-turn treatment, the following characteristics directly affect the operating speed for signalized diamond interchanges: • Hourly volume of interest (vph)
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38 Access Management in the Vicinity of Interchanges • Distance to the first downstream driveway (ft)
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Assessment Methodology 39 4.1.3 Partial Cloverleaf Interchange (PARCLO) The factors that influence the operating speed for crossroads in the vicinity of PARCLOs include: • Hourly volume (vph)
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40 Access Management in the Vicinity of Interchanges The estimated operating speeds can be calculated using the equations shown in Table 4-6. Upon inspection of this information, the following relationships can be noted: • As the hourly crossroad traffic volume increases, the operating speeds decrease.
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Assessment Methodology 41 toward the interchange increases by up to 1 mph. This results in an insignificant influence on operating speed for both directions of travel.
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42 Access Management in the Vicinity of Interchanges and increases for strategically positioned medians or TWLTL configurations. Notably, these values influence the speed by less than 1 mph and may be considered inconsequential in the analysis.
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Assessment Methodology 43 4.2 Crossroad Safety Performance Crossroad safety performance can be assessed qualitatively and quantitatively. 4.2.1 Qualitative Safety Assessment Examination of crash history and crash trends will help identify many of the infrastructurebased preventable crashes at a location.
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44 Access Management in the Vicinity of Interchanges 4.2.2 Quantitative Safety Assessment The AASHTO Highway Safety Manual (HSM) provides guidance for evaluating the predicted number of crashes for rural two-lane, rural multilane, and urban and suburban arterials (1)
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