DIVERGING DIAMOND INTERCHANGE · DIVERGING DIAMOND INTERCHANGE State Route 120/Union Road Diverging...

SR120/Union Road InterchangeSR120/Union Road InterchangeSR120/Union Road Interchange

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


PRESENTATION FOCUS

• Project History

• Interchange Innovation

• Existing Conditions

• Proposed Design

• Approval Process

• Final Details


PROJECT HISTORY


PROJECT HISTORY


PROJECT HISTORY


PROJECT HISTORY

• Existing Interchange Configuration

• Growth in Manteca

• Congestion along SR 120


Existing Conditions



PREVIOUS DESIGN

Partial Cloverleaf (Type L-9) • Provided Operational Improvements• Required Bridge Replacement• Non-Standard Design Features• High Construction Costs


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


ADJACENT DEVELOPMENT

• Existing & Planned Development

• Access Needs • Timing Concerns










1950’s

INTERCHANGE INNOVATION


1970’s



1980’s



1990’s



2000



2010



NOW



REVISED APPROACH• Traffic Conditions & Forecasts• Cost Savings through Design• Improved Development Access • Long Term Operational Efficiency






SR120/Union Road Interchange


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FHWA SA-14-067


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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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SR120/Union Road Interchange


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


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


FINAL DETAILS

• Class I Bike Path/Pedestrians

• Ramp Metering

• Single Lane On-Ramp

• Stopping Sight Distance


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OUTREACH


SCHEDULE

SPRING 2017APPROVED TRAFFIC ANALYSIS

SUMMER 2017ENVIRONMENTAL REVALIDATION

WINTER 2017 FINAL CONSTRUCTION DOCUMENTS

SPRING 2018 AWARD/CONSTRUCTION


QUESTIONS?QUESTIONS?

Date post:	10-Oct-2020
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DIVERGING DIAMOND INTERCHANGE · DIVERGING DIAMOND INTERCHANGE State Route 120/Union Road Diverging...

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