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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

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

Karen Jewel, Traffic Operations

Caltrans, D11, ICE Coordinator

intersection control evaluation ice caltrans traffic operations policy directive 13 02

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

intersection control evaluation ice
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
intersection control evaluation ice policy
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
intersection control evaluation ice policy1
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)

slide6

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
intersection control evaluation ice1
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

slide9

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

intersection control evaluation ice policy2

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

what isn t a modern roundabout
What isn’t a Modern Roundabout?

Traffic Circle

Rotary

Neighborhood Circle

complete streets road diet asheville nc
Complete Streets (Road Diet) Asheville, NC

Photo credits: Butzek

BEFORE: Signalized intersection with 6-lane cross-section

After Single-lane Roundabout

urban suburban rural applications
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

intersection control evaluation ice policy3

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

slide20

Roundabouts to Manage Speeds

Thru Main Streets, School Zones, etc.

Slide 11 - JC

20

slide21

Roundabouts at Interchanges

Source: Google Earth

intersection control evaluation ice2

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)

intersection control evaluation ice3

Website includes links to, and information on:

    • TOPD 13-02
    • FHWA Roundabout Website
    • Technical Assistance

Intersection Control Evaluation (ICE)

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District 11 ICE Coordinator:

  • Karen Jewel, Caltrans, D11, Traffic Operations
  • karen.jewel@dot.ca.gov (619) 688-6640

Intersection Control Evaluation (ICE)