Guide for the Analysis of Multimodal Corridor Access Management (2018) / Chapter Skim
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10 Description Techniques in this group have the common element of installing a non-traversable median to manage access by restricting left-turn access to a limited number of locations. A non-traversable median is installed along an extended section of undivided highway, or a TWLTL lane is replaced with a non-traversable median.
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Non-Traversable Medians 11 Access Management Technique Performance Trends and Documented Performance Relationships Operations Safety Install non-traversable median along undivided highway. ↕ ↕ ↕ ↕ ↕ ↑ ↕ ↕ Convert TWLTL to non-traversable median.
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12 Guide for the Analysis of Multimodal Corridor Access Management The magnitude of the corresponding change in average running speed will be slightly lower, as discussed in the appendix. When a non-traversable median is installed on an undivided roadway or a roadway with a TWLTL, through traffic will experience less delay than before, due to the reduction in the number of locations where left turns can be made (3)
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Non-Traversable Medians 13 pedestrian LOS score by 0.03 points (at 20 mph) to 0.08 points (at 50 mph)
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14 Guide for the Analysis of Multimodal Corridor Access Management A simulation study (15) found that converting a TWLTL to a raised median reduced bicycle speeds by 0.04 mph if no change in traffic volume resulted from the conversion.
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From page 15... ...
Non-Traversable Medians 15 References 1. Williams, K
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