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DIVERGING DIAMOND INTERCHANGEState Route 120/Union Road Diverging Diamond Retrofit
Presented by:Mark Houghton Sam Sherman Matt Brogan Aaron SilvaCity of Manteca Caltrans, District 10 Mark Thomas Mark Thomas
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PRESENTATION FOCUS
• Project History
• Interchange Innovation
• Existing Conditions
• Proposed Design
• Approval Process
• Final Details
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PROJECT HISTORY
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PROJECT HISTORY
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PROJECT HISTORY
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PROJECT HISTORY
• Existing Interchange Configuration
• Growth in Manteca
• Congestion along SR 120
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Existing Conditions
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PREVIOUS DESIGN
Partial Cloverleaf (Type L-9) • Provided Operational Improvements• Required Bridge Replacement• Non-Standard Design Features• High Construction Costs
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PREVIOUS DESIGN
• Project Study Report/Project Report Approved 2010• Initial Study/Mitigated Negative Declaration
Approved 2010Approved 2010
• 65% Design Plan Development
Results:• High Construction Costs • Adjacent Development Influence
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ADJACENT DEVELOPMENT
• Existing & Planned Development
• Access Needs • Timing Concerns
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ADJACENT DEVELOPMENT
• Existing & Planned Development
• Access Needs • Timing Concerns
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ADJACENT DEVELOPMENT
• Existing & Planned Development
• Access Needs • Timing Concerns
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1950’s
INTERCHANGE INNOVATION
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1970’s
INTERCHANGE INNOVATION
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1980’s
INTERCHANGE INNOVATION
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1990’s
INTERCHANGE INNOVATION
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2000
INTERCHANGE INNOVATION
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2010
INTERCHANGE INNOVATION
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NOW
INTERCHANGE INNOVATION
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REVISED APPROACH• Traffic Conditions & Forecasts• Cost Savings through Design• Improved Development Access • Long Term Operational Efficiency
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FHWA SA-14-067
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PE
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DDI BOUNDARY
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HDM 101.2 Highway Design Speed Standards
A = 45 mphM = 35 mph
----------------------------------DIB 90 25-35 mph
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HDM Chapter 200 Super Elevation Runoff & Curvature---------------------------------DIB 90 - -2%
FHWA Guide Exhibit 7-14
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HDM 504.3(3)Intersection Grade 4% or Less---------------------------------DIB 90 Grade shall be 5%
or less (Advisory)
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HDM 301.1 and Table 504.3Lane widths
----------------------------------DIB 90 HDM Standard
Applies
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HDM 1003.1 (8A) Bike Paths shall not be placed in median of a Local
Roadway-------------------------------------------DIB 90 Sidewalks, Multi-use Paths,
Class II Bike Lanes Acceptable
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40-45°
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LES
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APPROVALS PROCESS WITH CALTRANS
• Caltrans is CEQA lead Revalidation
• Caltrans will own and operate the results
• Draft DIB 90-DDI Guidelines (FHWA based)
• Govt. is slow to adopt new concepts• Risk Adverse
• Deeply Ingrained Culture
• Lengthy processes to create/adopt Non-STD Specs
• Gray boundaries of responsibilities
• Caltrans wants to set the proper precedence for future DDI
• Long Review Times - Multiple Reviews Numerous Reviewers
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PROCESS STICKING POINTS
• Traffic Operations Analysis (new counts, calibration, analysis)
• Concern over non-typical DDI pedestrian crossing
• Advisory and Mandatory Design Exceptions
• Request to install ramp metering, although not likely to be used
• Air Quality - RTP consistency (SJCOG effort to update RTP)
• Structure Type Selection
• Public Acceptance
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FINAL DETAILS
• Class I Bike Path/Pedestrians
• Ramp Metering
• Single Lane On-Ramp
• Stopping Sight Distance
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STO
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OUTREACH
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SCHEDULE
SPRING 2017APPROVED TRAFFIC ANALYSIS
SUMMER 2017ENVIRONMENTAL REVALIDATION
WINTER 2017 FINAL CONSTRUCTION DOCUMENTS
SPRING 2018 AWARD/CONSTRUCTION
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QUESTIONS?QUESTIONS?