bird rock ca corridor with roundabouts

__________________________________________________________________________Engineering & Capital Projects

Roundabout Product Demonstration Roundabout Product Demonstration ShowcaseShowcase

Bird Rock Traffic Flow Improvement Bird Rock Traffic Flow Improvement ProjectProject

December 10, 2008December 10, 2008

City of San DiegoCity of San DiegoEngineering & Capital Projects DepartmentEngineering & Capital Projects Department

Mike Arnold, Design Project ManagerMike Arnold, Design Project ManagerGary Chui, T.E.Gary Chui, T.E.

Project Design ConsultantsProject Design ConsultantsDomenic Lupo, P.E.Domenic Lupo, P.E.


Aerial View Looking Aerial View Looking NorthNorth


Seahaus Roundabout


Design Process – Began in 2004Design Process – Began in 2004

Construction Process – Began in 2007Construction Process – Began in 2007

Project HistoryProject HistoryPlanning Process Began in January 2000Planning Process Began in January 2000

4 Year Collaboration:4 Year Collaboration:City StaffCity Staff CommunityCommunity MerchantsMerchants ResidentsResidentsConsultantsConsultants

Commitment by council officeCommitment by council officeWalkable Communities Walkable Communities CharretteCharrette Walking ToursWalking Tours

Creation of Focus GroupsCreation of Focus Groups Bird Rock Traffic Task ForceBird Rock Traffic Task ForceBird Rock Beautification CommitteeBird Rock Beautification Committee

0.125 in3 per 3 min

340 ft3 per 8 years

http://upload.wikimedia.org/wikipedia/commons/7/70/Wooden_hourglass_3.jpg


Project PhasesProject Phases• Barrett/Seahaus Roundabouts:Barrett/Seahaus Roundabouts:

– Two roundabouts and landscaped center medianTwo roundabouts and landscaped center median– Two intersections: Colima and MidwayTwo intersections: Colima and Midway

• Bird Rock CIP Phase OneBird Rock CIP Phase One– Wrelton Street closureWrelton Street closure– Traffic circle at Sea Ridge and ChelseaTraffic circle at Sea Ridge and Chelsea– Traffic circle at Chelsea Ave. and Bird RockTraffic circle at Chelsea Ave. and Bird Rock– Pop-outs at Camino de la Costa and Chelsea St.Pop-outs at Camino de la Costa and Chelsea St.– Raised medians and pop outs at Camino de la Costa and BeaumontRaised medians and pop outs at Camino de la Costa and Beaumont– Traffic circle at Bellevue Ave. and Bird Rock Ave.Traffic circle at Bellevue Ave. and Bird Rock Ave.– Raised landscaped median on Forward St. between Bellevue Ave. and Taft Ave.Raised landscaped median on Forward St. between Bellevue Ave. and Taft Ave.– Mini-roundabout at La Jolla Hermosa and ColimaMini-roundabout at La Jolla Hermosa and Colima– Pop-outs on La Jolla Mesa Dr. and Linda Rosa Ave. and Colima St.Pop-outs on La Jolla Mesa Dr. and Linda Rosa Ave. and Colima St.– Speed Table on Dolphin Ave.Speed Table on Dolphin Ave.

• Bird Rock CIP Phase TwoBird Rock CIP Phase Two– Three roundabouts on La Jolla Blvd at the intersections of Camino de la Costa, Three roundabouts on La Jolla Blvd at the intersections of Camino de la Costa,

Bird Rock Ave., and Forward St.Bird Rock Ave., and Forward St.– Landscaped center medians from Camino de la Costa to MidwayLandscaped center medians from Camino de la Costa to Midway– Mini roundabout at the La Jolla Hermosa Ave/ForwardMini roundabout at the La Jolla Hermosa Ave/Forward– Landscaped median on La Jolla Mesa DriveLandscaped median on La Jolla Mesa Drive


DESIGN PROCESSDESIGN PROCESS• Geometrical Design

– Horizontal layout for chosen intersections– Design constraints included existing buildings &

r/w– Other design considerations included proposed

lane widths, proposed median, proposed parking– Input from Community

• Construction Documents– Tie proposed horizontal to existing roads– Add vertical design to horizontal layout– Coordinate pedestrian access– Coordinate sewer design– Design to acceptable City standards/FHWA

Guidelines


CHALLENGES• Unique Design Solution

• Accommodating Existing Drainage

• Roundabouts are relatively new to San Diego

• Fitting a ‘round peg in a square hole’

• Grading design (LJ Blvd flat, side streets steep)

• Construction – keep pedestrian and parking access open


CHALLENGES• Defining Project Scope:

– Pop-outs verses Traffic circle– Roundabouts verses Traffic circles– Additive Alternatives– Funding to match scope of work

• Right-of-Way/ Permits to Work on Private Property• Maintenance Assessment District formation• Horizontal Alignment• Design Vehicle - Turning template• Grant Funding Allocation and Authorization, HRER, Visual Impact Study• Impacts to Existing Improvements - Minimize

LESSONS LEARNED• Low-Bed Trailer• In-pavement Flashers• Landscaping – Low Maintenance and Site Visibility• Entry and Exit Width• Truck Apron Material• Survey Data• Intersection Angle


Before

Before

Defining Project Scope at CDefining Project Scope at Chelsea/Sea Ridgehelsea/Sea Ridge1200 1200 ADT (total intersection volume)ADT (total intersection volume)

8585thth percentile speed – 30 mph percentile speed – 30 mph


CChelsea/Sea Ridge - Afterhelsea/Sea Ridge - After


No ROW Impact Significant ROW Impact

Horizontal Geometry Adjustments During Design Minimize ROW Impact


Horizontal Geometry Adjustments During DesignLa Jolla Hermosa/Forward St. Final Design


La Jolla Hermosa/Forward St. Final Design


La Jolla Hermosa/Forward St. - Before


La Jolla Hermosa/Forward St. - After


La Jolla Hermosa/Forward St. - After(nearly complete)


Landscape ConceptMaintenance Assessment District


Landscape ConceptCommunity Effort


TYPICAL INTERSECTIONCamino de La Costa/La Jolla Blvd, Bird Rock/La Jolla Blvd, & Forward/La Jolla

Blvd

Additional Opportunity for Landscaping

Additional Landscaping


La Jolla Boulevard/Forward St.


• Turning template– Typical turning

template using Auto-Turn

– Buses– Fire Trucks– WB-50– SU-30– Through Movements– Left Turns– Right Turns


SU-30 Truck Turning Template Example on LJB/CDLC


Truck Turning Template Example on LJB/Forward St


Fire Truck Specifications


Fire Truck Left Turn Movement

75 % Design


La Jolla Blvd. and Forward St. – Intersection Angle


• Bus Stop Design– MTS Coordination– Near side vs. Far side– Dimensions 30-50-30

N


N

Bus Stop on La Jolla Blvd @ Camino De La Costa


Forward Bus Stop


City Bus Through Movement Simulation

Bird Rock


Bus Stop NW corner La Jolla Blvd. and Bird Rock Ave.

BeforeBefore

AfterAfter


La Jolla Blvd Roundabout – Truck Through Movement


La Jolla Blvd/Midway St. - Long Flatbed Trailer Video


Right of Way Impacts – La Jolla Blvd. and Forward St.

Southwest Corner – ROW Impact and Tree removal required (The tree has been blown down

by wind in February, 2005)Northeast corner - ROW Impact and impact

to planter box attached to the building

N


Right of Way Impacts – La Jolla Blvd. and Forward St.

Forward St.


Roundabout at La Jolla Blvd/Forward StBefore

After

Before


Proposed Design vs. Existing Improvements Bird Rock Ave. and La Jolla Blvd.

Might need temporary easement for construction.

Right of WayBack of New sidewalk


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


Low-bed Trailers & Truck Apron


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

N

La Jolla Blvd/Midway


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


• Example of new in-pavement flashers layout • Reduce pedestrian crossing time and exposure to vehicles• Street Width - 68 feet to two 14-foot segments• From 17 - 27 seconds to 3.5 – 5.6 seconds

In Pavement flashers

Traffic Flow

Traffic Flow

In-Pavement Flashers


In-Pavement Flashers at Midway and ColimaIn-Pavement Flashers at Midway and Colima


In-Pavement Flashers – New DesignIn-Pavement Flashers – New Design


Other Design Details

• Driveway Relocations

• Utility Relocation

• Median Maintenance Walkway

• Sewer Alignment – Offset to Centerline

• Impacts to Existing Improvements


Driveway Relocation

Existing driveway to be relocated

N


Driveway Relocation


Utility Pole Relocation


Landscape Maintenance WalkwayLandscape Maintenance Walkway


Traffic Control Phasing


Drainage Problem – La Jolla Blvd. to AlleyDrainage Problem – La Jolla Blvd. to Alley


Drainage Solution from La Jolla Blvd. to AlleyDrainage Solution from La Jolla Blvd. to Alley


Drainage Solution along La Jolla Blvd. crossing Drainage Solution along La Jolla Blvd. crossing Forward Ave.Forward Ave.


Concept


Camino de La Costa/ La Jolla Blvd

Before After


Bird Rock/ La Jolla Blvd

Before After


Forward/ La Jolla Blvd

Before After


Midway/ La Jolla Blvd

Before After


Colima/ La Jolla Blvd

Before After


New Guide Sign?? NOT supported by MUTCD or Local Agency


Thank You! (619) 533-4661

[email protected]

Photo: Mike Arnold

bird rock ca corridor with roundabouts

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