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DAG Traffic Primer
May 24, 2012
CASEY ARBORWAY PROJECT
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1. Previous Traffic Analysis Summary
2. Updates Post Planning Phase
3. Signal Coordination
4. Parking Supply
5. Transit Service and Accommodations
6. DAG #3: Mobility, Monday, June 18, 2012
Todays Agenda
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Key Assumptions in Traffic AnalysisTraffic Calming
Level of Service (LOS) & Queue Results
Right Turn TreatmentsTraffic Operations
Pedestrian Crossings
Transit Accommodations
Emergency Response Times
Alternative Routes
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How to calm traffic with wide median DAG #3
Rights on Red Allowed Design allows but
requires further
discussion on DAG #3
Level of Service (LOS) Presentation today
LOS with 2-lanes in each direction DAG #3
Location of Pedestrian and bike paths DAG #3
Path Analysis for all modes Experience
of Corridor
Presentation today
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North/south and east/west traffic flows Clarify
Alternative Regional Routes - Walk Hill? Clarify Design or
Construction Phase?
Parking loss of off-street impacts on
design
Presentation today
Emergency Response during Construction DAG #4
24 hour review of traffic volumes (peak and
non-peak)
Presentation today
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Previous Traffic Analysis
Summary
A Look Back
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Key Assumptions inTraffic Analysis
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Top 5 Areas of Concern Today
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:
Casey Overpass (Regional): + 5%
Surface Roads (Regional & Local): + 12%
+ 13%
+ 10%
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Overall volumes
Travel times
Air Quality
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Traffic Calming
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Level of Service &Queue Analysis Results
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Regional AnalysisCentral Transportation Planning
Staff Analysis
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CTPS Regional Traffic Model
Model runs for At-Grade and Bridge
Alternatives
Initial results show no significant changes to:
Traffic Volumes
Vehicle Miles Traveled (VMT)
Vehicle Hours Traveled (VHT)
Air Quality/Emissions
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Traffic Operations Improved for both
alternatives over existing conditions (see
Technical Memoranda)
Acceptable traffic operations provided forboth alternatives
Queues managed within available
storage area
Operations comparable for at-grade and
bridge alternatives
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Travel Time Comparison
Travel times for existing based oncurrent volumes and presented forcomparison only
Travel times for alternatives basedon 2035 volumes and analysis
Travel times are for peak hours
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Peak Hour Travel Time Results
Both alternatives improve overall travel times within
the project limits
Overall travel times for the alternatives are
comparable
At-grade improves travel time for many moves,
particularly north-south
At-grade increases travel time for affected left-turns
and east-west regional traffic (30-90 seconds)
Regional delays offset local travel time increases
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Future Operations with Modified
Lane Configurations
1. Pros and Cons of different lane
configurations
2. Queues and signalization
3. Right sizing roadway 2016 versus 2035
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Right-Turn Treatments
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Traffic Operations
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Future Traffic Conditions: Summary
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East West
Regional Travel
Regional travel times relatively unchanged for
overall trip Any in-bound delays at grade on New Washington
are offset by existing delays at Murray Circle
In fact, the new design of New Washington maymeter the travel times, providing more
systematic processing of traffic
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Bar chart of traffic by time of day
Discussion
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Pedestrian Crossings
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Pedestrian Crossings
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Transit Accommodations
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Transit Signalization
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School Bus Coordination
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Compiling data on busvolumes by peak hour,
including deadhead buses
Coordination on bus priorities
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Emergency ResponseTime
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Alternative Routes
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Local Diversions (cut-through)
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Casey Project Web Site Documentshttp://www.massdot.state.ma.us/caseyoverpass/
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Traffic
Documents
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Meetings
Notices
Presentations Graphics
Minutes
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Updates Post Planning Phase
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Conducted by CDM Smith
Dec. 11Jan 12
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Summary:
, the traffic analysis provided for the Casey overpass
Project has been performed in a professional manner
consistent with standard traffic engineering practices and
the guidelines of the MassDOT 2006 Project Development
and Design Guidebook.
traffic operations will be more efficient in the future year
with either alternative than the existing conditions or no
build conditions.
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Report on Evaluation of Two DesignOptions for Casey Overpass
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Traffic count data for Cemetery Road
Bus left-turn volumes
Minor graphic clarifications
Adjusted volumes at Orchardhill Road
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Ongoing/Future Traffic
Analysis Summary
A Look Ahead
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Signal Coordination
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:
Casey Arborway (E-W)
Washington Street (N-S)
Hyde Park Avenue (N-S)
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Parking Supply
On and Off-Street
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Existing Parking Supply
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Proposed Parking Supply
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Parking changes
were reflected in
the future traffic
volumes
(i.e. -LAZparking lot)
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Next Steps:
DAG #3: Mobility Topics
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:
Off-Peak Design Options
Build Year LOS, queues, delays
Turn Treatments
Signal Details
Bus Operations
Cut-Thru Traffic
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End of Presentation
Extra Slides
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Conceptual AlternativesTRAFFIC
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Traffic Simulations
Bridge Alternative
At-Grade Alternative
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How can traffic operations be similar?
North-south traffic volumes unchanged betweenalternatives
At-grade offers additional improvements to critical north-
south link on South Street Removal of Bridge only adds east-west through traffic to
surface streets (additional thru lanes provided at-grade)
All turning movements happen at grade regardless
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At-Grade Conceptual Alternative
DESIGNER GENERALS WARNING: THE DESIGN SHOWNHERE IS PRELIMINARY AND CONCEPTUAL, DESPITE THE
HARD LINE FINISHED STYLE RESULTING FROM THESOFTWARE PROGRAMS USED
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Bridge Conceptual Alternative
DESIGNER GENERALS WARNING: THE DESIGN SHOWN