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Caltrans External Advisory Liaison (CEAL) May 6, 2014 f Intersection Control Evaluation (ICE)

Caltrans External Advisory Liaison (CEAL) May 6, 2014 f Intersection Control Evaluation (ICE). Karen Jewel, Traffic Operations Caltrans, D11, ICE Coordinator. TODAYS BRIEFING OBJECTIVES: Inform members of the recent implementation that took effect at end of October 2013

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Caltrans External Advisory Liaison (CEAL) May 6, 2014 f Intersection Control Evaluation (ICE)

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  1. Caltrans External Advisory Liaison (CEAL)May 6, 2014fIntersection Control Evaluation (ICE) Karen Jewel, Traffic Operations Caltrans, D11, ICE Coordinator

  2. TODAYS BRIEFING OBJECTIVES: • Inform members of the recent implementation that took effect at end of October 2013 • Provide an overview of the traffic engineering process • Present a few examples of what is considered innovative intersection and interchange design • Provide reference and support information & services Intersection Control Evaluation (ICE) Caltrans Traffic Operations Policy Directive 13-02

  3. Intersection Control Evaluation (ICE) WHAT? - TOPD 13-02 (Traffic Operations Policy Directive) Update of traffic engineering process to identify solution options for intersections • Adds yield control and innovative alternative designs to our menu of choices • Yield control, i.e. roundabouts must now be considered in addition to Stop and Signal control • Streamlines the approval process within CT by updating the evaluation process

  4. Intersection Control Evaluation (ICE) Policy WHAT (continued)? • Must consider safety performance characteristics • Policy applies to the following proposals: • New intersections • New interchanges • Intersection expansion or modifications • Interchange expansion or modifications • Includes encroachment permit projects

  5. Intersection Control Evaluation (ICE) Policy • WHY? - Toincrease consideration & use of new but proven innovative designs - To make it easier for practitioners and partners to evaluate and pursue innovative alternatives - To make better Investment Decisions - To optimize intersection performance (mobility & safety)

  6. WHY THESE STRATEGIES? Want to choose the best intersection solution… • Best performance and lower O & M Costs • Least capital cost and ease to implement • Smallest project “footprints” (e.g. smaller X-sections) • Least impact on R/W & environment (air quality) • Smallest conflict areas • Least impact on pedestrians & bicyclists

  7. FACT: Smaller Footprint, R/W, Impacts & Cost Source: MTJ Engineering

  8. Intersection Control Evaluation (ICE) • HOW? TWO STEP PROCESS: STEP 1 – SCREENING/ASSESSMENT OF ALTERNATIVES Intergovernmental Review Pre-Project Initiation Phase & Project Initiation Phase STEP 2 – COMPARITIVE ENGINEERING ANALYSIS Intergovernmental Review During Project Approval and Environmental Document Phase

  9. ICE Process Steps, Activities & Outcomes Process Steps & Activities Outcomes Identification of one or more strategies that merit further consideration via engineering analysis/study because they are expected to meet the need for control, and are practical to pursue or implement 1. ASSESSMENT/SCREENING of Intersection Control Options & other Strategies • Performance Analysis Findings: • Safety - estimated cost / savings • Mobility - estimated delay costs / savings • 2. ENGINEERING ANALYSIS • of practical strategies via: • Traffic & Performance Analysis • Life-cycle/investment analysis Life-Cycle / Economic Analysis Findings Service Life (estimated years) Benefit / Cost Index Future Investment Needed to extend life TOPD 13-02 Page 8

  10. Example Innovative Design Alternative: Modern Roundabout * Now over 3,000 in U.S. (from zero in 1990) * Over 200 in California Intersection Control Evaluation (ICE) Policy

  11. What isn’t a Modern Roundabout? Traffic Circle Rotary Neighborhood Circle

  12. Vehicle Conflict Points

  13. Modern Roundabout

  14. Complete Streets (Road Diet) Asheville, NC Photo credits: Butzek BEFORE: Signalized intersection with 6-lane cross-section After Single-lane Roundabout

  15. Urban, Suburban & Rural Applications • Roundabouts are Viable Solutions from Zero to 50,000+ Vehicles a Day • Designs are very different depending on AADT and Turning Movements Livingston County, MI

  16. Intersection Control Evaluation (ICE) Policy Another Example Innovative Design Alternative: Diverging Diamond Interchange (Double Crossover Interchange) * FHWA is evaluating several U.S. installations Current Project Alternative at I-805 and Palm Avenue

  17. Diverging Diamond Interchange (DDI) Configuration

  18. Diverging Diamond Interchange (DDI)

  19. Diverging Diamond InterchangeNote Overcrossing Width • 2-phase signals Source: Ohio DOT

  20. Roundabouts to Manage Speeds Thru Main Streets, School Zones, etc. Slide 11 - JC 20

  21. Roundabouts at Interchanges Source: Google Earth

  22. ADDITIONAL DESIGN ALTERNATIVES • Information regarding these and other design alternatives can be found on the following ICE website: • ICE SUPPORT & REFERENCE INFORMATION • Website: • http://dot.ca.gov/hq/traffops/liaisons/ice.html Intersection Control Evaluation (ICE)

  23. Website includes links to, and information on: • TOPD 13-02 • FHWA Roundabout Website • Technical Assistance Intersection Control Evaluation (ICE)

  24. District 11 ICE Coordinator: • Karen Jewel, Caltrans, D11, Traffic Operations • karen.jewel@dot.ca.gov (619) 688-6640 Intersection Control Evaluation (ICE)

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