MassDOT Allston Interchange Improvement Project - Task Force meeting #2 presentation

TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON

I-90 ALLSTON INTERCHANGE

A MULTIMODAL TRANSPORTATION PROJECT

TASK FORCE MEETING #2MAY 21, 2014 – HONAN LIBRARY, ALLSTON


MassDOT Priorities

2

Improve Safety, Access & Connections for All ModesInterchan

geCambridg

e StTransit Neighborh

ood• Replace Viaduct• Realign I-90• Implement

AET• Context

Sensitive Design

• Redesign C-bridge St• Revitalize C-

bridge St• Reconfigure

Local Roadway Connections• Context

Sensitive Design

• Support S. Station Expansion, C-Rail, DMU, etc.• Context

Sensitive Design

• Avoid/minimize ROW/property displacements• Minimize

local impacts during construction• Context

Sensitive Design

The Bottom

LineUse available financial resources within timeframe

allotted


Taskforce Priorities

3

Improve Safety, Access & Connections for All ModesInterchan

geCambridg

e StTransit Neighborh

ood• Realign I-90• Minimize

interchange presence • Safe

connections to C-bridge St.• Increase

permeability across interchange• Context

Sensitive Design

• Safe connections to interchange• Less

interchange impact to C-bridge St.• Reconfigure

Local Roadway Connections• Improve safety• Context

Sensitive Design

• Connections between C-bridge St. & W. Station• Context

Sensitive Design

• Minimize local impacts during construction• Avoid new cut-

thru traffic• Reconnect

Allston• Foster local

business • Context

Sensitive DesignThe

Bottom Line

Improve safety, respect the neighborhood, reconnect Allston to itself & the Charles


Shared Priorities Improve safety for all modes:

walking, cycling, driving, transitRealign I-90Context sensitive design or:

Lessen impact of interchangeAvoid inducing cut-through traffic with

new configurationReconnect sections of Allston to each

other and the RiverProtect the neighborhood during

constructionA more vibrant Cambridge Street that

serves all modesAccessibility to transit at future West

Station

4


Traffic Analysis Area

5


Existing Highway Volumes

6

70,000

DAILY

55,000

56,000 73,000

75,000

72,000


Existing Ramp Volumes

7

15,000

DAILY

19,00016,000

16,000U-TURN = 1,000


1 ,500

5,600

Existing Highway & Ramp Volumes – AM Peak

8

7,100

I-90 EB OFF


1,300

4,100


9

5,400

I-90 WB OFF


1,1004,100


10

5,200

I-90 WB ON


1,8005,600


11

7,400

I-90 EB ON


1,300

3,900

Existing Highway & Ramp Volumes – PM Peak

12

5,200

I-90 EB OFF


1,400

4,500


13

5,900

I-90 WB OFF


1,5004,500


14

6,000

I-90 WB ON


1,6003,900


15

5,500

I-90 EB ON


70%

30%

Existing Ramp Distribution – AM Peak

16

EB OFF

1,500


30%

70%


17

WB OFF

1,300


30%70%


18

FROM CAMBRIDGE

ST

1,300


45%55%


19

FROM S.F.

ROAD1,300


60%

40%

Existing Ramp Distribution – PM Peak

20

EB OFF

1,300


35%

65%


21

WB OFF

1,400


25%75%


22

FROM CAMBRIDGE

ST

1,100


40%

60%


23

FROM S.F.

ROAD1,800


Existing Local Roadway Volumes – AM Peak

24

300400

300325

800

1,400800

1,200

550


Existing Local Roadway Volumes – PM Peak

25

450400

425450

1,200

1,4001,200

1,300

500


Local Roadway Bicycle Volumes – AM (PM) Peak

26

1 (2)1 (4)

1 (7)3 (3)

1 (1)

4 (3)

2 (4)

2 (2)

1 (1)

2 (2)


Local Roadway Pedestrian Volumes – AM (PM) Peak

27

20 (10)25 (15)

6 (7)

20 (40)15 (15)


Cambridge St/S.F. Rd – AM Peak Hour Volumes

28

55

TOTAL VOLUME2,455

1,200430

1,250

330

440


Cambridge St/S.F. Rd – PM Peak Hour Volumes

29

45

TOTAL VOLUME3,260

1,000740

1,530

675

800


Cambridge St/S.F. Rd – Traffic Signal Phasing

30

1.I-90 Off Ramps



31

1.I-90 Off Ramps2.Cambridge Street



32

1.I-90 Off Ramps2.Cambridge Street3.Hotel Exit



33

1.I-90 Off Ramps

2.Cambridge Street

3.Hotel Exit4.S.F. Road WB

Off Ramp


Cambridge St/S.F. Rd – PM Peak Hour Volumes

34

1.I-90 Off Ramps

2.Cambridge Street

3.Hotel Exit4.S.F. Road WB

Off Ramp 5.S.F. Road EB

Frontage Road


Interchange Concept Development – Traffic Considerations• Simplify the Cambridge

Street/Soldiers Field Road intersection

• Provide system that disperses rather than concentrates traffic flows

• Reduce traffic on Cambridge Street by providing multiple connection points

• Determine need for 2-lane ramps vs. 1-lane ramps

35


Project/Site Constraints

36

Operational(During

Construction)

Operational(Final

Configuration)

Physical Regulatory

Fiscal/Schedul

e



37

Operational(During

Construction)•Maintain all local connections•Maintain 8 lanes of travel on I-90•Maintain all rail service

Operational(Final

Configuration)

Physical Regulatory

Fiscal/Schedul

e



38

Operational(During


Operational(Final

Configuration)•Rail yard location south of I-90•Future Commuter Rail Station location• I-90 design

speed of 65 mph•On/off ramps lengths sufficient for acceleration/ deceleration and queuing

Physical Regulatory

Fiscal/Schedul

e



39

Operational(During


Operational(Final



Physical•Limited distance between River and BU property

Regulatory

Fiscal/Schedul

e


Existing Section Near Buick Street

40



41

Operational(During


Operational(Final



Physical•Limited distance between River and BU property•Clearance over rail yard –possible connections

Regulatory

Fiscal/Schedul

e


Preliminary Section Near Malvern Street

42



43

Operational(During


Operational(Final



Physical•Limited distance between River and BU property•Clearance over rail yard –possible connections•Right-of-way

Regulatory

Fiscal/Schedul

e



44

Operational(During


Operational(Final



Physical•Limited distance between River and BU property•Clearance over rail yard –possible connections•Right-of-way•Length required for street connections from Cambridge St over I-90

Regulatory

Fiscal/Schedul

e


Schematic Connector Location Limit

45

No Connections from Cambridge St over I-90 are Possible

750’

Proposed I-90Rail Yard

and Commuter Rail


Schematic Connector Profile

46



47

Operational(During


Operational(Final



Physical•Limited distance between River and BU property•Clearance over rail yard –possible connections•Right-of-way•Length required for street connections from Cambridge St over I-90•Potential subsurface contamination

Regulatory

Fiscal/Schedul

e



48

Operational(During


Operational(Final



Physical Regulatory•Historic

impacts Section 106•Parkland impacts Section 4(f)•Stormwater treatment

Fiscal/Schedul

e•Limited distance between River and BU property•Clearance over rail yard –possible connections•Right-of-way•Length required for street connections from Cambridge St over I-90•Potential subsurface contamination



49

Operational(During


Operational(Final



Physical Regulatory•Historic

impacts Section 106•Parkland impacts Section 4(f)•Stormwater treatment

Fiscal/Schedul

e•Funds identified from Capital Improvement Plan (CIP) FY14-FY18 (approx $160M)•Schedule linked to AET coming on-line 2016

•Limited distance between River and BU property•Clearance over rail yard –possible connections•Right-of-way•Length required for street connections from Cambridge St over I-90•Potential subsurface contamination


Preliminary Interchange Concept Design

50

GROUP 1Suburban Type• One

intersection for on-ramps

• One intersection for off-ramps

GROUP 2Suburban Type• One

intersection for EB on-ramps & WB off-ramps

• One intersection for WB on-ramps & EB off-ramps

GROUP 3Urban Type

• Split diamond configuration


Option 1A

51


Option 1B

52


Option 1C

53


Option 1D

54


Option 2A

55


Option 2B

56


Option 3A

57


Option 3B

58


Option 3C

59


Option 3D

60


Option 3E

61


Option 3F

62


Parcel Ownership Map

63


Project Locus

64

Documents

MassDOT Allston Interchange Improvement Project - Task Force meeting #2 presentation