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. 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. STATE’SFIRSTDDIINTERCHANGE Who is Mark Thomas? 90 Years in business 11 offices/180 staff Fairly New to Southern CA
- 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 + +
- 25. RAMP PRIORITY
- 26. RAMP PRIORITY
- 36. GEOMETRIC DESIGN CRITERIA HDM 101.2 – Highway Design Speed Standards A = 45 mph M = 35 mph ---------------------------------- DIB 90 – 25-35 mph
- 37. GEOMETRIC DESIGN CRITERIA HDM Chapter 200 – Super Elevation Runoff & Curvature --------------------------------- DIB 90 – R=225’-250’ |e=-2% FHWA Guide Exhibit 7-14
- 38. GEOMETRIC DESIGN CRITERIA HDM 504.3(3) – Intersection Grade 4% or Less --------------------------------- DIB 90 – Grade shall be 5% or less (Advisory)
- 39. GEOMETRIC DESIGN CRITERIA HDM 301.1 and Table 504.3 – Lane widths ---------------------------------- DIB 90 – HDM Standard Applies
- 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
- 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
- 47. 1950’s1950’s 1970’s1970’s 1980’s1980’s 2010’s2010’s1990’s1990’s 2000’s2000’s NOWNOW CHANGING TIMES