Roadway Cross-Section Reallocation: A Guide (2023) / Chapter Skim
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Appendix C: Decision Support Matrix
Appendix C: Decision Support Matrix
Pages 170-175
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From page 170... ...
costs High High Adverse effect: Removed exclusive biking space leads to Adverse effect: reduced access to physical reduced comfort of bicyclists, likely leading to more riding activity, reduced incentive for local trips High Medium in the sidewalk or travel lanes, increased conflicts and Medium affecting community building, and increased Adverse effect: Unless there is a low stress, direct Remove Adverse effect: Decrease in accessibility lack of predictable behavior, and less use and less Adverse effect: due to induced driving causing direct exposure to emissions. Reduces ability for alternate route, removing a bike lane is likely to make bike lanes impacts local businesses and individuals' expectation of bicyclist presence and behavior increased emissions some communities (zero- or low-car households, biking an inviable mode for many, decreasing bike travel costs and options; The Caltrans Local Roadway Safety Manual cites a 55% younger/older populations, disabled mode split.
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From page 171... ...
Also decreases Medium pedestrian Positive safety effect if it increases width above minimally travel costs and options; provides space Positive effect: increased propensity to walk to destination accessibility, placemaking, inviting Positive effect: Increases propensity to walk to facility safe width or ADA standard widths that can be used to support area destinations, reducing driving and related emissions atmosphere. Reduces ability for some destinations, likely increasing walking mode split.
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From page 172... ...
Compound positive effect of potentially inducing triple vehicle travel lanes Adverse effect: if buses share a travel lane, congestion divergence in the long term and reducing ADT -- the most can decrease reliability and travel times, thereby closely associated factor with crash risk decreasing the viability of and attractiveness of transit, Motor Vehicles reducing the liklihood for mode shift to transit. Medium Low Narrow Positive effect: unless existing lane widths were No significant effect Medium Low Positive effect: Reduces speeds and travel times, travel lanes necessary for design vehicles.
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From page 173... ...
Medium Adverse effect: Removing a two way left turn lane may Motor Vehicles increase the frequency of rear end crashes and reduces the opportunties for pedestrian refuge islands but positively reduces crossing distance if refuge islands did Low Low Low not exist; removing a TWLT may generate a desire for Remove Decreases motor vehicle access to Positive effect: Decreased capacity/motor vehicle No significant effect Positive effect: Decreased capacity/motor vehicle additional motor vehicle lanes to maintain similar traffic TWLTL businesses/services in areas where there access may lead to decreased volumes over time access may lead to decreased volumes over time may often allows for a four to three lane conversion, are driveways/access points which can decreate pedestrian exposure and crossing distance;motor vehicle safety benefits are most seen in environments with many access points. Removes opportunities to have a wide center planted median in areas along a TWLT without access points.
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From page 174... ...
13.4.2.7) High Low Positive effect2 : Motorized vehicle crash rate decreases.
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From page 175... ...
double parking (hazardous behavior) ; street parking can remove space for loading/unloading Long-Term: Positive effect: Decreased parking access act as traffic calming delivery vehicles can reduce demand for driving over time, reducing VMT/emissions Low Positive effect: Reduce pedestrian crossing exposure No significant effect unless narrowing Narrow Adverse effect: If bicycle facilities are adjacent, it may affects ability to use parking as loading No significant effect No significant effect No significant effect parking increase likelihood of "dooring"; may increase conflicts zones, in which case there would be a Parking between people entering/exiting their vehicles and medium negative effect moving motor vehicles Low Adverse effect: Increase pedestrian crossing exposure No significant effect unless widening allows Widen Positive effect: If bicycle facilities are adjacent, it may parking to be used as a loading zone, in No significant effect No significant effect No significant effect parking decrease likelihood of "dooring"; may decrease conflicts which case there would be a medium between people entering/exiting their vehicles and positive effect moving motor vehicles Low Medium Adverse effect: Increased conflicts from parking Medium Positive effect: Decreased circling for parking and maneuvers; increased access to parking may increase Positive effect: Increased access to associated emissions -- provided all else equal, and driving demand/VMT, thereby increasing crashes commercial uses, if managed Low that street parking constitutes a meaningful share of High Potential sight distance issues for driveways or at appropriately, ability to serve for Positive effect: All else equal, decreases amount Add parking area parking.
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