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ASCE OC Branch - T&DI Luncheon - Delivering the State's First Diverging Diamond Interchange

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American Society of Civil Engineers, Orange County Branch, Transportation and Development Institute with the Programs Committee Present - Delivering the State's First Diverging Diamond Interchange. Presentation by Rob Himes, President of Mark Thomas, and Aaron Silva, Deputy Project Manager, on the innovative solutions employed for delivering the first DDI in California in the city of Manteca at SR 120 and Union Road Interchange in Conjunction with Caltrans.

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ASCE OC Branch - T&DI Luncheon - Delivering the State's First Diverging Diamond Interchange

  1. 1. STATE’SFIRSTDDIINTERCHANGE DELIVERING THE STATE’S FIRST DIVERGING DIAMOND INTERCHANGE Presented by Rob Himes & Aaron Silva January 18, 2018 ASCE Presentation State Route 120/Union Road Diverging Diamond Retrofit
  2. 2. STATE’SFIRSTDDIINTERCHANGE Who is  Mark Thomas?  90 Years in business  11 offices/180 staff  Fairly New to Southern CA
  3. 3. STATE’SFIRSTDDIINTERCHANGE • Respect • Fairness • Transparency • Flexibility • Creativity • Collaboration • Accountability • Ownership CORE VALUESOUR FOCUS CLIENT Solution‐oriented approach & ideas that  guide the best outcome COMMUNITY Reinforcing the basic values of freedom & togetherness  through enhanced mobility OUR PEOPLE Providing a supportive environment that fosters  teamwork & upward mobility + +
  4. 4. STATE’SFIRSTDDIINTERCHANGE HIGHWAY DESIGN IN CALIFORNIA
  5. 5. STATE’SFIRSTDDIINTERCHANGE INTERCHANGE INNOVATIONINTERCHANGE INNOVATION 1950’s1950’s
  6. 6. STATE’SFIRSTDDIINTERCHANGE INTERCHANGE INNOVATIONINTERCHANGE INNOVATION 1970’s1970’s
  7. 7. STATE’SFIRSTDDIINTERCHANGE INTERCHANGE INNOVATIONINTERCHANGE INNOVATION 1980’s1980’s
  8. 8. STATE’SFIRSTDDIINTERCHANGE INTERCHANGE INNOVATIONINTERCHANGE INNOVATION 1990’s1990’s
  9. 9. STATE’SFIRSTDDIINTERCHANGE INTERCHANGE INNOVATIONINTERCHANGE INNOVATION 2000’s2000’s
  10. 10. STATE’SFIRSTDDIINTERCHANGE INTERCHANGE INNOVATIONINTERCHANGE INNOVATION 2010’s2010’s
  11. 11. STATE’SFIRSTDDIINTERCHANGE NOWNOW INTERCHANGE INNOVATIONINTERCHANGE INNOVATION
  12. 12. STATE’SFIRSTDDIINTERCHANGE
  13. 13. STATE’SFIRSTDDIINTERCHANGE
  14. 14. STATE’SFIRSTDDIINTERCHANGE PROJECT LOCATION MANTECA
  15. 15. STATE’SFIRSTDDIINTERCHANGE UNION ROAD AIRPORTWAY MAIN STREET
  16. 16. STATE’SFIRSTDDIINTERCHANGE
  17. 17. STATE’SFIRSTDDIINTERCHANGE
  18. 18. STATE’SFIRSTDDIINTERCHANGE
  19. 19. STATE’SFIRSTDDIINTERCHANGE FHWA SA‐14‐067
  20. 20. TRAFFIC OPERATIONS
  21. 21. TRAFFIC OPERATIONS
  22. 22. TRAFFIC OPERATIONS
  23. 23. CROSS STREET PRIORITY
  24. 24. CROSS STREET PRIORITY
  25. 25. RAMP PRIORITY
  26. 26. RAMP PRIORITY
  27. 27. PEAK HOUR TRAFFIC
  28. 28. PEDESTRIAN  CIRCULATION
  29. 29. PEDESTRIAN  CIRCULATION
  30. 30. PEDESTRIAN  CIRCULATION
  31. 31. PEDESTRIAN  CIRCULATION
  32. 32. STATE’SFIRSTDDIINTERCHANGE
  33. 33. STATE’SFIRSTDDIINTERCHANGE
  34. 34. STATE’SFIRSTDDIINTERCHANGE During Construction Bicyclists using  pedestrian  overcrossing. Post Construction Bicyclists using  New Trail. Low bicycle  usage once new  trail was  constructed
  35. 35. DDI BOUNDARY GEOMETRIC DESIGN CRITERIA
  36. 36. GEOMETRIC DESIGN CRITERIA HDM 101.2 – Highway Design Speed Standards A = 45 mph M = 35 mph ---------------------------------- DIB 90 – 25-35 mph
  37. 37. GEOMETRIC DESIGN CRITERIA HDM Chapter 200 – Super Elevation Runoff & Curvature --------------------------------- DIB 90 – R=225’-250’ |e=-2% FHWA Guide Exhibit 7-14
  38. 38. GEOMETRIC DESIGN CRITERIA HDM 504.3(3) – Intersection Grade 4% or Less --------------------------------- DIB 90 – Grade shall be 5% or less (Advisory)
  39. 39. GEOMETRIC DESIGN CRITERIA HDM 301.1 and Table 504.3 – Lane widths ---------------------------------- DIB 90 – HDM Standard Applies
  40. 40. GEOMETRIC DESIGN CRITERIA 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
  41. 41. GEOMETRIC DESIGN CRITERIA 40‐45°
  42. 42. GEOMETRIC DESIGN CRITERIA
  43. 43. STATE’SFIRSTDDIINTERCHANGE 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
  44. 44. SINGLE LANE ON‐RAMP
  45. 45. STOPPING SIGHT DISTANCE
  46. 46. STATE’SFIRSTDDIINTERCHANGE WHAT HAVE WE LEARNED?
  47. 47. 1950’s1950’s 1970’s1970’s 1980’s1980’s 2010’s2010’s1990’s1990’s 2000’s2000’s NOWNOW CHANGING TIMES
  48. 48. STATE’SFIRSTDDIINTERCHANGE
  49. 49. INNOVATIVE SOLUTIONS
  50. 50. STATE’SFIRSTDDIINTERCHANGE FINAL DESIGN
  51. 51. STATE’SFIRSTDDIINTERCHANGE QUESTIONS?

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