Project History Interchange Innovation Existing Conditions Proposed Design Approval Process Final Details PRESENTATION FOCUS
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1 DIVERGING DIAMOND INTERCHANGE State Route 120/Union Road Diverging Diamond Retrofit Presented by: Mark Houghton Sam Sherman Matt Brogan Aaron Silva City of Manteca Caltrans, District 10 Mark Thomas Mark Thomas
2 Project History Interchange Innovation Existing Conditions Proposed Design Approval Process Final Details PRESENTATION FOCUS
3 PROJECT HISTORY
4 PROJECT HISTORY
5 PROJECT HISTORY
6 Existing Interchange Configuration Growth in Manteca Congestion along SR 120 PROJECT HISTORY
7 Existing Conditions
8
9 Partial Cloverleaf (Type L-9) Provided Operational Improvements Required Bridge Replacement Non-Standard Design Features High Construction Costs PREVIOUS DESIGN
10 PREVIOUS DESIGN Project Study Report/Project Report Approved 2010 Initial Study/Mitigated Negative Declaration Approved % Design Plan Development Results: High Construction Costs Adjacent Development Influence
11 Existing & Planned Development Access Needs Timing Concerns ADJACENT DEVELOPMENT
12 Existing & Planned Development Access Needs Timing Concerns ADJACENT DEVELOPMENT
13 Existing & Planned Development Access Needs Timing Concerns ADJACENT DEVELOPMENT
14 INTERCHANGE INNOVATION 1950 s
15 INTERCHANGE INNOVATION 1970 s
16 INTERCHANGE INNOVATION 1980 s
17 INTERCHANGE INNOVATION 1990 s
18 INTERCHANGE INNOVATION 2000
19 INTERCHANGE INNOVATION 2010
20 INTERCHANGE INNOVATION NOW
21 REVISED APPROACH Traffic Conditions & Forecasts Cost Savings through Design Improved Development Access Long Term Operational Efficiency
22
23
24
25
26
27
28
29 SR120/Union ionion onr Road n Road Interchange nge
30 SR120/Union ionion onr Road n Road Interchange nge
31 FHWA SA
32 TRAFFIC OPERATIONS 1
33 TRAFFIC OPERATIONS
34 TRAFFIC OPERATIONS
35 CROSS STREET PRIORITY
36 CROSS STREET PRIORITY
37 RAMP PRIORITY
38 RAMP PRIORITY
39 PEAK HOUR TRAFFIC
40 PEDESTRIAN CIRCULATION
41 PEDESTRIAN CIRCULATION
42 PEDESTRIAN CIRCULATION
43 PEDESTRIAN CIRCULATION
44 GEOMETRIC DESIGN CRITERIA DDI BOUNDARY
45 GEOMETRIC DESIGN CRITERIA HDM Highway Design Speed Standards A = 45 mph M = 35 mph DIB mph
46 GEOMETRIC DESIGN CRITERIA HDM Chapter 200 Super Elevation Runoff & Curvature DIB % FHWA Guide Exhibit 7-14
47 GEOMETRIC DESIGN CRITERIA HDM 504.3(3) Intersection Grade 4% or Less DIB 90 Grade shall be 5% or less (Advisory)
48 GEOMETRIC DESIGN CRITERIA HDM and Table Lane widths DIB 90 HDM Standard Applies
49 GEOMETRIC DESIGN CRITERIA HDM (8A) Bike Paths shall not be placed in median of a Local Roadway DIB 90 Sidewalks, Multi-use Paths, Class II Bike Lanes Acceptable
50 GEOMETRIC DESIGN CRITERIA 40-45
51 GEOMETRIC DESIGN CRITERIA
52 LESSONS LEARNED
53 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
54 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
55 FINAL DETAILS Class I Bike Path/Pedestrians Ramp Metering Single Lane On-Ramp Stopping Sight Distance
56 PEDESTRIAN CIRCULATION
57 PEDESTRIAN CIRCULATION
58 PEDESTRIAN CIRCULATION
59 RAMP METER QUEUES
60 RAMP METER QUEUES
61 SINGLE LANE ON N-RAMP
62 STOPPING SIGHT DISTANCE
63 STOPPING SIGHT DISTANCE
64 STOPPING SIGHT DISTANCE
65 OUTREACH
66 SPRING 2017 SCHEDULE APPROVED TRAFFIC ANALYSIS SUMMER 2017 ENVIRONMENTAL REVALIDATION WINTER 2017 FINAL CONSTRUCTION DOCUMENTS SPRING 2018 AWARD/CONSTRUCTION
67 QUESTIONS?
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