A T A Tale ale of of Tw Two o Intersec ersectio ions ns Sarah Doggett, Josh Eskedt, Frank Feng, Maria Sol Tadeo November 2017.
Agenda 1. Goal 2. Existing Conditions 3. Corridor Treatment 4. Intersection Alternative 1: Roundabout 5. Intersection Alternative 2: Protected Intersection 6. Transit Considerations 7. Minor Intersection Design 8. Turning Analysis 9. Urban Design 10.Parking 11.Evaluation 12.Questions
Goal For intersections at Adeline St and MLK Jr Way and at Adeline St and Stanford Ave ● Improve safety for all users ● Increase ease of use for pedestrians and cyclists - ● Complement Adeline St redesign by removing these two intersections as barriers to pedestrians and cyclists
Corridor Treatment Existing Conditions ● Six lanes ● Protected diagonal parking ● Sidewalk far away from the street
Corridor Treatment What we picked ● Adeline-MLK ● Adeline-MLK-Stanford ● Will tie intersections into option B in Adeline Corridor Study
Corridor Treatment Why Road Diet? “With the demise of the streetcar in the late 1940s, the right of way was repurposed. Today, up to 38,000 vehicles a day use the street and Adeline has become one of Berkeley’s busiest (and widest) thoroughfares. The challenge today is to “humanize” the street so that Adeline can once again … [be] safer, more attractive, and more comfortable. It can also create new open spaces, community gathering Corridor Auto Volumes and Capacities places, and development opportunities Segment Phase # Lanes Capacity Volume on repurposed land ... Where development Present 6 54000 37800 takes place, affordable housing and other Adeline Between MLK (South) and MLK (North) “public benefit” uses will be a priority (City of Future 4 36000 >37800? Berkeley, 2017).” Source: Fehr and Peers, 2015; Highway Capacity Manual, Transportation Research Board, 2010.
Corridor Treatment Proposed section for Adeline
Intersection Design Alternative 1: Roundabout Roundabout Advantages • Safer : similar collision rate but lower collision severity • Fewer motor vehicle stops : reduced emission and fuel consumption • Require no signaling equipment : less chance of malfunction • Beautification: improved urban landscape Source: (1) ASCE Webinar “Analysis of Roundabouts” Jason D. Pack and Fred Choa, Oct. 2011 (2) NCHRP 672
Intersection Design Alternative 1: Roundabout Assume: - Negligible truck Feasibility Analysis volume - Minimal U-turn Source: (1) Federal Highway Administration, “Roundabouts, an Informational Guide”, 2010 (2) Highway Capacity Manual, 2010.
Intersection Design Alternative 1: Roundabout Assume: - Negligible truck Feasibility Analysis volume - Minimal U-turn Source: (1) Federal Highway Administration, “Roundabouts, an Informational Guide”, 2010 (2) Highway Capacity Manual, 2010.
Intersection Design Alternative 1: Roundabout Assume: - Negligible truck Feasibility Analysis volume - Minimal U-turn Configuration does not work Not enough ROW Source: (1) Federal Highway Administration, “Roundabouts, an Informational Guide”, 2010 (2) Highway Capacity Manual, 2010.
Intersection Design Alternative 1: Roundabout Assume: - Negligible truck Feasibility Analysis volume - Minimal U-turn Source: (1) Federal Highway Administration, “Roundabouts, an Informational Guide”, 2010 (2) Highway Capacity Manual, 2010.
Intersection Design Alternative 1: Roundabout Assume: - Negligible truck Feasibility Analysis volume - Minimal U-turn Configuration works BUT not enough ROW Source: (1) Federal Highway Administration, “Roundabouts, an Informational Guide”, 2010 (2) Highway Capacity Manual, 2010.
Intersection Design Alternative 2: Protected Intersection Protected Intersection ● Bicycles can make a safe right turn without interacting with traffic ● Right turning cars have a better visual of crossing ped and bikes ● The crossing distance is reduced Alta planning (2015) Alta planning (2015)
Intersection Design Alternative 2: Protected Intersection Proposed Adeline/MLK
Intersection Design Alternative 2: Protected Intersection Design ● Bikelane and sidewalk at the same level ● Removing parking ● Central medians
Intersection Design Alternative 2: Protected Intersection Design Special lane to accommodate bus Right turn prohibition on Adeline stop
Intersection Design Alternative 2: Protected Intersection Proposed Adeline/MLK/Stanford ● Road Diet => 6 to 4 lanes
Intersection Design Alternative 2: Protected Intersection Particular features ● Continuous Bike lanes ● Protected intersection. Riders can make right turns without leaving the intersection ● Bike lanes at the same level as the sidewalk
Intersection Design Alternative 2: Protected Intersection Particular features ● New crosswalk on south MLK ● Reduced crossing distances ● Every crossing is ADA Compliant
Transit Considerations Bus Stop NACTO web We propose a raised Bus Stop: ● Make boarding accessible for everyone ● Make transit faster Taking care of transit will encourage active transportation
Minor Intersection Alcatraz Ave
Minor Intersection Alcatraz Ave
Minor Intersection Harmon St
Minor Intersection Harmon St
Turning Analysis Adeline/MLK/Stanford: WB-50 Intermediate Semi
Turning Analysis Adeline/MLK: WB-50 Intermediate Semi
Turning Analysis Alcatraz Ave Intersection: 40 ft. Fire Truck
Turning Analysis Harmon St Intersection: 40 ft. Fire Truck
Turning Analysis Bus Stop: 40 ft Bus
Parking Parking Design Parallel Parking • Stall Dimension: 18 ft by 8 ft • Gap: 5 ft (with disabled parking having larger gap for convenient access) • Solid delineator separating parking from traffic • 5-ft buffer to account for door opening, cargo unloading, sidewalk access
Parking Parking Reduction
Parking Implementation ● Monitoring ● TDM Program ○ Transit pass ● Parking Benefit District ● Performance-based Pricing ○ SF Park
Urban Design Public Plaza at Adeline/MLK/Stanford Inspirations: Source: http://www.sf- Source: planning.org/ftp/BetterStreets/docs/FINAL_6_St https://kchealthyincentives.files.wordpress.com/ reetscape_Elements.pdf 2013/08/138376.jpg Source: https://globaldesigningcities.org/publication/glob al-street-design-guide/streets/pedestrian- priority-spaces/pedestrian-plazas/case-study- plaza-program-new-york-city-usa/
Urban Design Importance of Street Furniture “Site furnishings announce that pedestrians are welcome and that the street is a comfortable place to be. These amenities provide a functional service to the pedestrian and provide visual detail that makes a place comfortable and interesting” - Better Streets, SF Planning Source: http://groundplaysf.org/wp- content/uploads/Plaza_Materials_Catalog_V.4-15- 2016_lr.pdf
Urban Design Opportunities for Public Art -Sculptures with seating opportunities -Fountains - Murals Source: http://www.sf- planning.org/ftp/BetterStreets/docs/FINAL_6_Streetscap - Decorative utilities, trash e_Elements.pdf cans, water fountains Source: http://www.sf- planning.org/ftp/BetterStreets/docs/FINAL_6_Streets cape_Elements.pdf Source: http://www.urbangardensweb.com/wp- Source: https://thebolditalic.com/how- content/uploads/2013/08/fountain- oakland-is-turning-trash-cans-into-art- fotomaurer11_MG_5102.jpg 22766925b7a5
Urban Design Clearly Defined Edges - Removable bollards around the dead end of 63rd access to provide limited Source: http://www.sf- vehicle access to planning.org/ftp/BetterStreets/docs/FINAL_6_Stree tscape_Elements.pdf plaza (e.g. for Farmer’s Market) - Combination of bioretention planters and Source: decorative http://www.reliance- foundry.com/site/reliance- bollards to define foundry/images/gallery/removable- edges of plaza bollard-walkway.jpg Source: https://nacto.org/publication/urban-street-stormwater-guide/stormwater- elements/green-stormwater-elements/bioretention-planter/
Urban Design Stormwater Management Elements - Floating island bioretention planters in most of the buffer zones between cars and the bike lane - Also provides physical barrier between cars and bikes Source: https://nacto.org/publication/urban-street-stormwater-guide/stormwater-elements/green- infrastructure-configurations/floating-island-planter/
Urban Design More Stormwater Elements In wider areas, such as the bulb outs at intersections, we can place hybrid Source:https://nacto.org/publication/urban-street-stormwater-guide/stormwater- elements/green-stormwater-elements/hybrid-bioretention-planter/ bioretention planters Bioretention swales will be placed along the sidewalks between Alcatraz and Fairview Source:https://nacto.org/publication/urban-street-stormwater-guide/stormwater- elements/green-stormwater-elements/bioretention-swale/
Evaluation - Bicycles 3 components: Why • LTS, Segment • LTS, Intersection LTS? approach • LTS, Crossing Source: Berkeley Bicycle Plan Public Survey Source: City of Berkeley BMP 2017
Recommend
More recommend
