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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
TASK FORCE MEETING #2 – 5/21/14 – 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
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
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
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
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
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Traffic Analysis Area
5
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Existing Highway Volumes
6
70,000
DAILY
55,000
56,000 73,000
75,000
72,000
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Existing Ramp Volumes
7
15,000
DAILY
19,00016,000
16,000U-TURN = 1,000
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
1 ,500
5,600
Existing Highway & Ramp Volumes – AM Peak
8
7,100
I-90 EB OFF
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
1,300
4,100
Existing Highway & Ramp Volumes – AM Peak
9
5,400
I-90 WB OFF
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
1,1004,100
Existing Highway & Ramp Volumes – AM Peak
10
5,200
I-90 WB ON
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
1,8005,600
Existing Highway & Ramp Volumes – AM Peak
11
7,400
I-90 EB ON
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
1,300
3,900
Existing Highway & Ramp Volumes – PM Peak
12
5,200
I-90 EB OFF
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
1,400
4,500
Existing Highway & Ramp Volumes – PM Peak
13
5,900
I-90 WB OFF
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
1,5004,500
Existing Highway & Ramp Volumes – PM Peak
14
6,000
I-90 WB ON
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
1,6003,900
Existing Highway & Ramp Volumes – PM Peak
15
5,500
I-90 EB ON
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
70%
30%
Existing Ramp Distribution – AM Peak
16
EB OFF
1,500
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
30%
70%
Existing Ramp Distribution – AM Peak
17
WB OFF
1,300
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
30%70%
Existing Ramp Distribution – AM Peak
18
FROM CAMBRIDGE
ST
1,300
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
45%55%
Existing Ramp Distribution – AM Peak
19
FROM S.F.
ROAD1,300
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
60%
40%
Existing Ramp Distribution – PM Peak
20
EB OFF
1,300
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
35%
65%
Existing Ramp Distribution – PM Peak
21
WB OFF
1,400
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
25%75%
Existing Ramp Distribution – PM Peak
22
FROM CAMBRIDGE
ST
1,100
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
40%
60%
Existing Ramp Distribution – PM Peak
23
FROM S.F.
ROAD1,800
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Existing Local Roadway Volumes – AM Peak
24
300400
300325
800
1,400800
1,200
550
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Existing Local Roadway Volumes – PM Peak
25
450400
425450
1,200
1,4001,200
1,300
500
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Local Roadway Bicycle Volumes – AM (PM) Peak
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1 (2)1 (4)
1 (7)3 (3)
1 (1)
4 (3)
2 (4)
2 (2)
1 (1)
2 (2)
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Local Roadway Pedestrian Volumes – AM (PM) Peak
27
20 (10)25 (15)
6 (7)
20 (40)15 (15)
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Cambridge St/S.F. Rd – AM Peak Hour Volumes
28
55
TOTAL VOLUME2,455
1,200430
1,250
330
440
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Cambridge St/S.F. Rd – PM Peak Hour Volumes
29
45
TOTAL VOLUME3,260
1,000740
1,530
675
800
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Cambridge St/S.F. Rd – Traffic Signal Phasing
30
1.I-90 Off Ramps
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Cambridge St/S.F. Rd – Traffic Signal Phasing
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1.I-90 Off Ramps2.Cambridge Street
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Cambridge St/S.F. Rd – Traffic Signal Phasing
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1.I-90 Off Ramps2.Cambridge Street3.Hotel Exit
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Cambridge St/S.F. Rd – Traffic Signal Phasing
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1.I-90 Off Ramps
2.Cambridge Street
3.Hotel Exit4.S.F. Road WB
Off Ramp
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
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
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
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
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Project/Site Constraints
36
Operational(During
Construction)
Operational(Final
Configuration)
Physical Regulatory
Fiscal/Schedul
e
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Project/Site Constraints
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
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Project/Site Constraints
38
Operational(During
Construction)•Maintain all local connections•Maintain 8 lanes of travel on I-90•Maintain all rail service
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
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Project/Site Constraints
39
Operational(During
Construction)•Maintain all local connections•Maintain 8 lanes of travel on I-90•Maintain all rail service
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•Limited distance between River and BU property
Regulatory
Fiscal/Schedul
e
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Existing Section Near Buick Street
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Project/Site Constraints
41
Operational(During
Construction)•Maintain all local connections•Maintain 8 lanes of travel on I-90•Maintain all rail service
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•Limited distance between River and BU property•Clearance over rail yard –possible connections
Regulatory
Fiscal/Schedul
e
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Preliminary Section Near Malvern Street
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Project/Site Constraints
43
Operational(During
Construction)•Maintain all local connections•Maintain 8 lanes of travel on I-90•Maintain all rail service
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•Limited distance between River and BU property•Clearance over rail yard –possible connections•Right-of-way
Regulatory
Fiscal/Schedul
e
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Project/Site Constraints
44
Operational(During
Construction)•Maintain all local connections•Maintain 8 lanes of travel on I-90•Maintain all rail service
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•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
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Schematic Connector Location Limit
45
No Connections from Cambridge St over I-90 are Possible
750’
Proposed I-90Rail Yard
and Commuter Rail
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Schematic Connector Profile
46
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Project/Site Constraints
47
Operational(During
Construction)•Maintain all local connections•Maintain 8 lanes of travel on I-90•Maintain all rail service
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•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
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Project/Site Constraints
48
Operational(During
Construction)•Maintain all local connections•Maintain 8 lanes of travel on I-90•Maintain all rail service
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•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
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Project/Site Constraints
49
Operational(During
Construction)•Maintain all local connections•Maintain 8 lanes of travel on I-90•Maintain all rail service
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•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
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
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
TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Option 1A
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Option 1B
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Option 1C
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Option 1D
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Option 2A
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Option 2B
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Option 3A
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Option 3B
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Option 3C
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Option 3D
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Option 3E
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Option 3F
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Parcel Ownership Map
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TASK FORCE MEETING #2 – 5/21/14 – HONAN LIBRARY, ALLSTON
Project Locus
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