INMAN SQUARE INTERSECTIONIMPROVEMENTS PROJECT

Community Meeting #2 | May 2, 2017

INMAN SQ PROJECT

Agenda

ProjectBackground

PreferredConcept

Next StepsAlternativesEvaluation

Project Background

Project Timeline

Describe existingcondition constraints

InitialTransportationStudySummer 2015

June 2016Presentation toCommunity, initialfindings ofTransportation Study

Cyclist FatalityJune 2016

Inman IntersectionProject KickoffOctober 2016

EnhancedpavementmarkingsinstalledAugust 2016

No Left TurnsImplementedNovember 2016

BCU/KittlesonCharrette forroundabout designDecember 2016

Community Meeting #1aJanuary 24, 2017;#1b February 7, 2017

Conceptual DesignOverviewMay 2, 2017

MassDOT WalkAnd BikeAssessmentFall 2014

Project Background

Initial Transportation Study

• Complaints of high delay for all modes oftransportation

o Long signal cycle lengthso High volumes of bicyclists

• Existing operational deficiencieso Layout of crosswalks irregularo Large intersection for bicyclists and

vehicles to traverse

• Review of Crash Data 2008-2012o 69 total crashes in 5 years (exceeds

MassDOT avg Statewide crash rate)o Most frequent type of crash type –

angle crasho 15 bicycle involved crashes, 5

pedestrian involved crashes

Project Background

Existing Conditions1. Crosswalks outside of

desire lines and some notsignal controlled

2. Existing geometry resultsin long distance forpedestrians and bikes totravel

3. No signal control forHampshire StreetSouthbound turn toAntrim Street

4. Issues with clearancetime for all users

5. Unclear lane control onCambridge Street

• Reduce unnecessaryvehicular delay

• Provide clear guidanceand lane controls

• Increase efficiencythrough more compactintersection design

Alternatives Evaluation

Desired Outcomes

• Reduce exposurethrough morecompact intersectiondesign

• Minimize conflictswith turning vehicles

• Provide separation

• Reduce length ofcrosswalks and signalwait times

• Provide more directcrosswalk routing

• Provide improvedpedestrianenvironment throughlandscaping andenhanced amenities

• Reduce bus/transitdelay

• Improve location ofand access to MBTAbus stops

• Provide pedestrianplaza adjacent tobusinesses

Desired Outcomes (continued)Alternatives Evaluation

• Maintain truck accessthrough intersection

• Maintain protectedfirehouse egress/access

Preliminary ConceptsAlternatives Evaluation

Community FeedbackFEEDBACK RESULTS FEEDBACK HIGHLIGHTS

• Maintain Springfield St as 2-way

• Consider traffic impacts to Fayette Stand Antrim St

• Desire for crosswalk at heart ofintersection

• Desire for new pedestrian open space

• Consideration for fire station and truckaccess

• Support for separated bike lanefacilities but also concerns for parking

• Positive feedback on floating bus stops

60% signalized concept

Alternatives Evaluation

Other Stakeholder Feedback

Inman Square NeighborhoodAssociation• Preferred Bend Northside• Desired open space adjacent to

retail

Cambridge Fire Department• Requested signalized

intersection

Joint Bike/Ped/Transit Committee• Preferred Bend Northside• Support for plaza space adjacent to

businesses• Concerned with lack of signalized

crossings in Roundabout option

MBTA• No preferred concept• In favor of transit priority• MBTA willing to consider Bus Route

91 relocation to Prospect Street

Alternatives Evaluation

City of Somerville• No preferred concept• Maintain 2-way Springfield St

Boston Cyclists Union/CambridgeBicycle Safety• Preferred Roundabout

Roundabout

Signalized Concept

Design Option PerspectivesExisting conditions

Alternatives Evaluation

Design Option Perspectives

Signalized Roundabout

Alternatives Evaluation

Design Option PerspectivesAlternatives Evaluation

RoundaboutSignalized

Evaluation ConsiderationsAlternatives Evaluation

• Improve operations, safety, and comfort for allmodes of transportation

• Accommodate fire station access withadequate signal clearance

• Assign clear right-of-way for pedestrians,bicyclists, and motorists at crossings

• Address pedestrian and bicycle desire lines

• Accommodate all necessary truck movements

• Create usable open space and placemakingopportunities

• Minimize changes to side street directions

Evaluation ConsiderationsAlternatives Evaluation

Truck turning

WB-50 vehicle (large truck) turning paths

Evaluation ConsiderationsAlternatives Evaluation

Bus turning

MBTA Bus turning paths

Evaluation ConsiderationsAlternatives Evaluation

Pedestrian-oriented open space analysis

Signalized Concept: 7,100 SFRoundabout: 5,000 SF

PREFERRED CONCEPT

Design Highlights

Create new VellucciPlaza adjacent to retail

Maintain drivewayaccess to businesses

1 2

1. Separated bike lanethrough existingVellucci Plaza

Maintain large calipertrees

Maintain and/or expandHubway station

2.

PREFERRED CONCEPT

Design Highlights

Reverse direction ofAntrim Street3

4

3. Balance betweenparking and transit

Transit priorityopportunity

4.

Vehicle turn lanes toallow for protectedpedestrian crossings

Potential to improvemorning peak hourservice on MBTA BusRoute 91

5.

5

PREFERRED CONCEPT

Design Highlights

Maintain two-waydirection on SpringfieldStreet

Relocate MBTA BusRoute 91 to ProspectStreet

6

6. Pedestrian crossing atheart of intersection

Signalized access tofire house maintained

7.

7

PREFERRED CONCEPT

Signalized Concept– Signal Phasing

PREFERRED CONCEPT

Transit Benefits

• Buses stop in travel lane, minimizing bus delay and improving accessibility• Additional space for amenities such as bus shelters• Bikes separated from bus conflicts

Floating bus stops

PREFERRED CONCEPT

Transit Benefits

• Lane for buses to pull out ahead of traffic• Most effective in morning peak

Transit priority on Cambridge Street (eastbound)

PREFERRED CONCEPT

Transit BenefitsMBTA bus routes

• Improved stops forRoutes 69 and 83

• Route 91 to ProspectStreeto .15 mile relocationo Low ridership on

Springfield Streeto More direct routing

and faster run times,particularly withUnion Squarechanges

PREFERRED CONCEPT

Parking Considerations

PREFERRED CONCEPT

Parking ConsiderationsParking retention

• 61 on-street spaces total

• About 50% of on-streetspaces retained

o 49% parking retainedwith transit priority(during AM peakperiod)

o 54% parking retainedwithout transitpriority/non-peakperiod Note: The number of spaces in Lot 14 off Springfield Street, and resident permit on-street

parking, are not included in the parking inventory analysis/percent retained calculations.

PREFERRED CONCEPT

Truck Access

• Fire truck access into and out of fire housefor all approaches

• WB-62 turn at Hampshire St. and CambridgeSt. intersection

Accommodate truck movements

PREFERRED CONCEPT

Pedestrian/Bike Considerations

Protected intersections Separated bike lanes Raised crosswalks

Signalized bike crossings Two stage queue boxes Colored pavement markings

PREFERRED CONCEPT

Open Space Considerations

1

2 3

4

PREFERRED CONCEPT

Open Space ConsiderationsExamples

Usable Open Space with Tree CanopyYorkville Park, Toronto, ON

Flexible Open Space Next to StorefrontsSquare Dancing in Lafayette Sq., Cambridge

1 2

PREFERRED CONCEPT

Open Space ConsiderationsExamples

Memorable Site ElementsMassArt Residence Hall, Boston

Expanded Plaza Space / Distinctive GroundNew Road, Brighton, UK

3 4

NEXT STEPS

Next Steps

CommunityMeeting #3Summer 2017

CompleteFinal DesignSummer 2017

Construction StartFall 2017

CommunityMeeting #4Fall 2017

Complete 25%Conceptual DesignSpring 2017

COMMENTS & QUESTIONS

CONTACT INFORMATION:

Kelly Dunn, Community Relations Managerkdunn@cambridgema.gov

www. cambridgema.gov/theworks/inmansquare

Preliminary Concepts

Q&A Material

DESIGN OPTIONS

Toolbox Design ElementsVehicle Types

WB-62

WB-50

SU-30

DESIGN OPTIONS

Toolbox Design ElementsBike Lanes

DESIGN OPTIONS

Toolbox Design ElementsOpen Space/Pedestrian

DESIGN OPTIONS

Toolbox Design ElementsBus Stops

DESIGN OPTIONS

Toolbox Design ElementsPrepared by McMahon Associates

Bicycle lane transitions down, sidewalk stays upBicycle transition down towards roadway level. A cross slope on the bike lane allows a short curb reveal which creates a smallpedestrian ramp. Pedestrians wait on sidewalk behind the bike lane.

Raised CrossingRoadway comes up to bike lane and sidewalk level. Noneed for bicycle or pedestrian ramps.

Protected Corner IslandsBicycle lane is at roadway level. Pedestrian ramp is on sidewalk.Pedestrians cross bike lane and wait within protected corner island.

Cambridge, MAWestern Ave Boston, MAStaniford Street

Cambridge, MAWestern AveBoston, MAStaniford Street

Ramp Designs

DESIGN OPTIONS

Toolbox Design ElementsBicycle Ramp: Roadway Level to Sidewalk LevelThe bike lane transitions to sidewalk level without a horizontal transition.

Vassar Street

Davis, CA

Shared Bike/Ped Crossing at Protected IntersectionBicycle and pedestrian areas are combined and lowered to create oneshort ramp. The ped/bike areas are delineated with colors.

Davis, CA

Bicycle Ramp: Sidewalk Level to Roadway LevelThe bike lane transitions from sidewalk level to roadway level before ahorizontal transition.

Vassar Street

Bicycle Ramp: Sidewalk Level to Roadway LevelTransitions both vertically and horizontally from sidewalk level toroadway level. Uses a “Bend-Out” intersection treatment.

Missoula, MT

Prepared by McMahon AssociatesRamp Designs

Roundabout