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3113113 Curb 6densions(Bulb-outs)I SF Better Streets <br /> Shape <br /> Bulb-outs should strive for a rectilinear shape to keep a direct path of travel and to regularize crossings and <br /> curb ramps.The adjacent figures show alternative bulb-out shapes with the same turn radius.The figure at <br /> left provides greater overall space for pedestrians waiting to cross the street,which may be useful at impacted <br /> locations.The figure at right provides more clear directionality and direct curb ramps,as well as a tighter <br /> corner.Both alternatives are acceptable;the resulting design should be balanced with the overall goals of the <br /> project. <br /> Bulb-Out Shape Alternatives <br /> CM <br /> A2 RWIM Uffn Wks <br /> OpOn 1:A aborter oroaft and Opilm 2,Greaw dhodiormlity and <br /> fariter overaN bWb4M stualw curb rafts <br /> Other design features <br /> Bollards,planters,or other fixed objects may be placed at the back of curb where necessary to protect <br /> pedestrians and prevent vehicles from driving onto the sidewalk. <br /> Where curb extensions will be added,they should be reviewed by DPW Hydraulics to ensure that there is <br /> sufficient hydraulic capacity within the street cross-section.Stormwater features can help to offset reduced <br /> capacity from curb extensions. <br /> Curb extensions may require relocation of corner catch basins. <br /> Generally,fire hydrants must be located within 18-24"of the curb face for visibility,which often means <br /> relocating a hydrant when a project will change an existing curb line.However,per agreement with the San <br /> Francisco Fire Department,in locations where only bulb-outs are being constructed(as opposed to locations <br /> where an entire block face will be widened),fire hydrants may remain in their existing location(aligned with <br /> the prevailing curb line),reducing the cost of constructing the bulb-out. <br /> See Interdepartmental Standards Relating to the Placement of Fire Hydrants with Respect to Distance to <br /> Curb(PDF) <br /> Extended Bulb-Outs <br /> Longer curb extensions may be considered to create space for seating,landscaping,stormwater features,and <br /> other amenities,particularly in areas lacking in open space. <br /> Extended bulb-outs should use special paving or an edging treatment to distinguish the space as a plaza <br /> space separate from the through travel area.Street furnishings and other above-grade objects should be <br /> located on curb extensions outside of crossing areas to increase space for pedestrian through travel on the <br /> sidewalk. <br /> Mid-Block Bulb-Outs <br /> Mid-block bulb-outs may be considered on all street types to provide additional sidewalk space for <br /> landscaping,seating,stormwater treatment,and amenities,and improve safety at mid-block crossings by <br /> shortening crossing distances and enhancing pedestrian visibility.Mid-block bulb-outs should follow these <br /> guidelines: <br /> ■ They should include bollards,landscaping,or other buffers between pedestrians and passing vehicles, <br /> designed to not impede a driver's view of pedestrians. <br /> • Thev should use scedal Davin or an edaino treatment to distinouish the space as a plaza soace <br /> v,mw.sfbefterstreets.org/find-project-types/pedestrian-safety-ard-trage-caining/traffic-calning-owNieWcurb-e)densions/ 415 <br />