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?

Conclusions & Lessons Learned

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