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Uk Roundabout Research

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A Presentation to US and Canadian DOT and MTO staff.

A Presentation to US and Canadian DOT and MTO staff.

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Uk Roundabout Research Uk Roundabout Research Presentation Transcript

  • UK Roundabout Research
    Presented by Mike HuttTransportation Division
  • UK Roundabout Research
    Agenda
    Why the Priority Rule?
    1
    Implementation of the Priority Rule
    2
    Ensuring robust results
    3
    Research into capacity relationships
    4
    International validation
    5
  • Why the Priority rule?
    • First British roundabout built 1909
    • No set rules for driver behaviour
    • “Locked” Roundabouts Common
    • Police used to control traffic until congestion was relieved
  • Why the Priority rule?
    • By early 1960’s traffic levels sufficient to overload junctions
    • Signal Control trialled at Roundabouts
    • Alternative method tested giving priority to circulating traffic on the Roundabout
  • Why the Priority rule?
    The Offside Priority rule proved instrumental against alternatives in reducing congestion and improving safety at Roundabouts
    Delay / flow curves for a roundabout in Leeds, Northern England
  • Implementation of the Priority Rule
    What illustrates priority most obviously?
  • Implementation of the Priority Rule
    Frank C. Blackmore’s research faced strong opposition, the key to the success of the Priority Rule was the use of white painted road markings across the entry to which the rule applied
  • Ensuring Robust Results
    • 86 Roundabout entries
    • 11,000 minutes of capacity operation
    • 500,000 vehicles observed
    • 1427 injury accidents studied
    • 431 junction years of accident data
    • Over 5 years of accident data at each site
    • Research duration 10 – 12 years
    • Equivalent current cost of
    approximately $20 million (US)
  • Research Into Capacity Relationships
    Rod M. Kimber’s research into the traffic capacity relationships at roundabouts had the specific aim of producing reliable results for use by a Traffic Engineer
  • Research Into Capacity Relationships
    Numerous researched equations were used to build the now world renowned International Empirical Methodology
  • International Validation
    The Empirical Methodology has been employed in over 90 countries for more than three decades by…
    • National Governments in their Transportation Guidelines
    • Universities to teach Roundabout Engineering
    • Multi-national organisations for accurate results
    • Large and small Consultancies for Design and Analysis
  • Mike Hutt
    mhutt@trl.co.uk
    +44 (0)7786 154 010
    www.trl.co.uk
    Any Questions?