Bird Rock CA corridor with roundabouts


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Detail of the Traffic Flow Improvement project in Bird Rock, CA, suburban San Deigo

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  • Dozens of news stories, Previous W&S projects,
  • More Drainage
  • Drainage, Drainage, Drainage. Offset left to roundabout entry for high speed entry
  • On La Jolla Boulevard, pedestrians used to have 68 feet of pavement to across. With implementation of roundabouts, all pedestrians would cross only one lane or 14 feet of pavement at a time (one lane in each direction with 10 feet of median that serves as pedestrian refuge area). This would substantially reduce pedestrian exposure to traffic.
  • Right of Way restriction, certain movements of a WB-50 design vehicle cannot be accomodated. As the minimum design standard, the roundabouts can accommodate all turning movements of a SU-30 design vehicle, Single Unit Truck.
  • At 30% design the SU-30 could barely clear the acute angled left turns. Redesign on entry and exit width were necessary.
  • The followings are turning simulations of a semi-trailer truck, WB-50, with current design of roundabouts, and with the modified design of with a narrower circulatory roadway width. As the graphs show, a WB50 truck can barely clear obtuse angled left turns with current designs, and the truck will not be able to clear the obtuse angled left turns with the narrower entry width design.
  • Highway Design Manual Page 400-2
  • Modify curb and gutter radius (increase) so trailing wheels avoid curb
  • Passenger comfort, Driver may avoid using truck apron, nearly 3 feet of overhang
  • Condensation inside pavement flashers, Damaged pavement flashers, Damaged concrete
  • Bird Rock CA corridor with roundabouts

    1. 1. Roundabout Product Demonstration Showcase Bird Rock Traffic Flow Improvement Project December 10, 2008 City of San Diego Engineering & Capital Projects Department Mike Arnold, Design Project Manager Gary Chui, T.E. Project Design Consultants Domenic Lupo, P.E.
    2. 2. Aerial View Looking North
    3. 3. Seahaus Roundabout
    4. 4. Project History <ul><li>Planning Process Began in January 2000 </li></ul><ul><li>4 Year Collaboration: </li></ul><ul><li>City Staff Community Merchants Residents Consultants </li></ul><ul><li>Commitment by council office </li></ul><ul><li>Walkable Communities Charrette Walking Tours </li></ul><ul><li>Creation of Focus Groups Bird Rock Traffic Task Force </li></ul><ul><li>Bird Rock Beautification Committee </li></ul><ul><li>Design Process – Began in 2004 </li></ul><ul><li>Construction Process – Began in 2007 </li></ul>0.125 in 3 per 3 min 340 ft 3 per 8 years
    5. 5. Project Phases <ul><li>Barrett/Seahaus Roundabouts: </li></ul><ul><ul><li>Two roundabouts and landscaped center median </li></ul></ul><ul><ul><li>Two intersections: Colima and Midway </li></ul></ul><ul><li>Bird Rock CIP Phase One </li></ul><ul><ul><li>Wrelton Street closure </li></ul></ul><ul><ul><li>Traffic circle at Sea Ridge and Chelsea </li></ul></ul><ul><ul><li>Traffic circle at Chelsea Ave. and Bird Rock </li></ul></ul><ul><ul><li>Pop-outs at Camino de la Costa and Chelsea St. </li></ul></ul><ul><ul><li>Raised medians and pop outs at Camino de la Costa and Beaumont </li></ul></ul><ul><ul><li>Traffic circle at Bellevue Ave. and Bird Rock Ave. </li></ul></ul><ul><ul><li>Raised landscaped median on Forward St. between Bellevue Ave. and Taft Ave. </li></ul></ul><ul><ul><li>Mini-roundabout at La Jolla Hermosa and Colima </li></ul></ul><ul><ul><li>Pop-outs on La Jolla Mesa Dr. and Linda Rosa Ave. and Colima St. </li></ul></ul><ul><ul><li>Speed Table on Dolphin Ave. </li></ul></ul><ul><li>Bird Rock CIP Phase Two </li></ul><ul><ul><li>Three roundabouts on La Jolla Blvd at the intersections of Camino de la Costa, Bird Rock Ave., and Forward St. </li></ul></ul><ul><ul><li>Landscaped center medians from Camino de la Costa to Midway </li></ul></ul><ul><ul><li>Mini roundabout at the La Jolla Hermosa Ave/Forward </li></ul></ul><ul><ul><li>Landscaped median on La Jolla Mesa Drive </li></ul></ul>
    6. 6. DESIGN PROCESS <ul><li>Geometrical Design </li></ul><ul><ul><li>Horizontal layout for chosen intersections </li></ul></ul><ul><ul><li>Design constraints included existing buildings & r/w </li></ul></ul><ul><ul><li>Other design considerations included proposed lane widths, proposed median, proposed parking </li></ul></ul><ul><ul><li>Input from Community </li></ul></ul><ul><li>Construction Documents </li></ul><ul><ul><li>Tie proposed horizontal to existing roads </li></ul></ul><ul><ul><li>Add vertical design to horizontal layout </li></ul></ul><ul><ul><li>Coordinate pedestrian access </li></ul></ul><ul><ul><li>Coordinate sewer design </li></ul></ul><ul><ul><li>Design to acceptable City standards/FHWA Guidelines </li></ul></ul>
    7. 7. CHALLENGES <ul><li>Unique Design Solution </li></ul><ul><li>Accommodating Existing Drainage </li></ul><ul><li>Roundabouts are relatively new to San Diego </li></ul><ul><li>Fitting a ‘round peg in a square hole’ </li></ul><ul><li>Grading design (LJ Blvd flat, side streets steep) </li></ul><ul><li>Construction – keep pedestrian and parking access open </li></ul>
    8. 8. CHALLENGES <ul><li>Defining Project Scope: </li></ul><ul><ul><li>Pop-outs verses Traffic circle </li></ul></ul><ul><ul><li>Roundabouts verses Traffic circles </li></ul></ul><ul><ul><li>Additive Alternatives </li></ul></ul><ul><ul><li>Funding to match scope of work </li></ul></ul><ul><li>Right-of-Way/ Permits to Work on Private Property </li></ul><ul><li>Maintenance Assessment District formation </li></ul><ul><li>Horizontal Alignment </li></ul><ul><li>Design Vehicle - Turning template </li></ul><ul><li>Grant Funding Allocation and Authorization, HRER, Visual Impact Study </li></ul><ul><li>Impacts to Existing Improvements - Minimize </li></ul><ul><li> LESSONS LEARNED </li></ul><ul><li>Low-Bed Trailer </li></ul><ul><li>In-pavement Flashers </li></ul><ul><li>Landscaping – Low Maintenance and Site Visibility </li></ul><ul><li>Entry and Exit Width </li></ul><ul><li>Truck Apron Material </li></ul><ul><li>Survey Data </li></ul><ul><li>Intersection Angle </li></ul>
    9. 9. Defining Project Scope at C helsea/Sea Ridge 1200 ADT (total intersection volume) 85 th percentile speed – 30 mph Before Before
    10. 10. C helsea/Sea Ridge - After
    11. 11. No ROW Impact Significant ROW Impact Horizontal Geometry Adjustments During Design Minimize ROW Impact
    12. 12. Horizontal Geometry Adjustments During Design La Jolla Hermosa/Forward St. Final Design
    13. 13. La Jolla Hermosa/Forward St. Final Design
    14. 14. La Jolla Hermosa/Forward St. - Before
    15. 15. La Jolla Hermosa/Forward St. - After
    16. 16. La Jolla Hermosa/Forward St. - After (nearly complete)
    17. 17. Landscape Concept Maintenance Assessment District
    18. 18. Landscape Concept Community Effort
    19. 19. TYPICAL INTERSECTION Camino de La Costa/La Jolla Blvd, Bird Rock/La Jolla Blvd, & Forward/La Jolla Blvd Additional Opportunity for Landscaping Additional Landscaping
    20. 20. La Jolla Boulevard/Forward St.
    21. 21. La Jolla Boulevard/Forward St.
    22. 22. <ul><li>Turning template </li></ul><ul><ul><li>Typical turning template using Auto-Turn </li></ul></ul><ul><ul><li>Buses </li></ul></ul><ul><ul><li>Fire Trucks </li></ul></ul><ul><ul><li>WB-50 </li></ul></ul><ul><ul><li>SU-30 </li></ul></ul><ul><ul><li>Through Movements </li></ul></ul><ul><ul><li>Left Turns </li></ul></ul><ul><ul><li>Right Turns </li></ul></ul>
    23. 23. SU-30 Truck Turning Template Example on LJB/CDLC
    24. 24. Truck Turning Template Example on LJB/Forward St
    25. 25. Fire Truck Specifications
    26. 26. Fire Truck Left Turn Movement 75 % Design
    27. 27. La Jolla Blvd. and Forward St. – Intersection Angle
    28. 28. <ul><li>Bus Stop Design </li></ul><ul><ul><li>MTS Coordination </li></ul></ul><ul><ul><li>Near side vs. Far side </li></ul></ul><ul><ul><li>Dimensions 30-50-30 </li></ul></ul>N
    29. 29. Bus Stop on La Jolla Blvd @ Camino De La Costa N
    30. 30. Forward Bus Stop
    31. 31. City Bus Through Movement Simulation Bird Rock
    32. 32. Bus Stop NW corner La Jolla Blvd. and Bird Rock Ave. Before After
    33. 33. La Jolla Blvd Roundabout – Truck Through Movement
    34. 34. La Jolla Blvd/Midway St. - Long Flatbed Trailer Video
    35. 35. Right of Way Impacts – La Jolla Blvd. and Forward St. <ul><li>Southwest Corner – ROW Impact and Tree removal required (The tree has been blown down by wind in February, 2005) </li></ul><ul><li>Northeast corner - ROW Impact and impact to planter box attached to the building </li></ul>N
    36. 36. Right of Way Impacts – La Jolla Blvd. and Forward St. Forward St.
    37. 37. Roundabout at La Jolla Blvd/Forward St Before After Before
    38. 38. Proposed Design vs. Existing Improvements Bird Rock Ave. and La Jolla Blvd. Might need temporary easement for construction. Right of Way Back of New sidewalk
    39. 39. Bird Rock Ave. and La Jolla Blvd. SW corner Back of proposed sidewalk Southwest Corner of La Jolla Blvd/Bird Rock N ROW Impact: 10sqft
    40. 40. Low-bed Trailers & Truck Apron
    41. 41. Trailer Model TA35 34.2ft from the truck’s rearmost to the trailer’s foremost axle Overall length of a tractor semi-trailer combination: 65ft La Jolla Blvd/Midway N
    42. 42. Trailer Model TA35 34.2ft from the truck’s rearmost to the trailer’s foremost axle Overall length of a tractor semi-trailer combination: 65ft La Jolla Blvd/Colima N
    43. 43. <ul><li>Example of new in-pavement flashers layout </li></ul><ul><li>Reduce pedestrian crossing time and exposure to vehicles </li></ul><ul><li>Street Width - 68 feet to two 14-foot segments </li></ul><ul><li>From 17 - 27 seconds to 3.5 – 5.6 seconds </li></ul>In Pavement flashers Traffic Flow Traffic Flow In-Pavement Flashers
    44. 44. In-Pavement Flashers at Midway and Colima
    45. 45. In-Pavement Flashers – New Design
    46. 46. Other Design Details <ul><li>Driveway Relocations </li></ul><ul><li>Utility Relocation </li></ul><ul><li>Median Maintenance Walkway </li></ul><ul><li>Sewer Alignment – Offset to Centerline </li></ul><ul><li>Impacts to Existing Improvements </li></ul>
    47. 47. Driveway Relocation Existing driveway to be relocated N
    48. 48. Driveway Relocation
    49. 49. Utility Pole Relocation
    50. 50. Landscape Maintenance Walkway
    51. 51. Traffic Control Phasing
    52. 52. Drainage Problem – La Jolla Blvd. to Alley
    53. 53. Drainage Solution from La Jolla Blvd. to Alley
    54. 54. Drainage Solution along La Jolla Blvd. crossing Forward Ave.
    55. 55. Concept
    56. 56. Camino de La Costa/ La Jolla Blvd Before After
    57. 57. Bird Rock/ La Jolla Blvd Before After
    58. 58. Forward/ La Jolla Blvd Before After
    59. 59. Midway/ La Jolla Blvd Before After
    60. 60. Colima/ La Jolla Blvd Before After
    61. 62. New Guide Sign?? NOT supported by MUTCD or Local Agency
    62. 63. Thank You! (619) 533-4661 [email_address] Photo: Mike Arnold