Uk Roundabout Research

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A Presentation to US and Canadian DOT and MTO staff.

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Uk Roundabout Research

  1. 1. UK Roundabout Research<br />Presented by Mike HuttTransportation Division<br />
  2. 2. UK Roundabout Research<br />Agenda<br />Why the Priority Rule?<br />1<br />Implementation of the Priority Rule<br />2<br />Ensuring robust results<br />3<br />Research into capacity relationships<br />4<br />International validation<br />5<br />
  3. 3. Why the Priority rule?<br /><ul><li>First British roundabout built 1909
  4. 4. No set rules for driver behaviour
  5. 5. “Locked” Roundabouts Common
  6. 6. Police used to control traffic until congestion was relieved</li></li></ul><li>Why the Priority rule?<br /><ul><li>By early 1960’s traffic levels sufficient to overload junctions
  7. 7. Signal Control trialled at Roundabouts
  8. 8. Alternative method tested giving priority to circulating traffic on the Roundabout</li></li></ul><li>Why the Priority rule?<br />The Offside Priority rule proved instrumental against alternatives in reducing congestion and improving safety at Roundabouts<br />Delay / flow curves for a roundabout in Leeds, Northern England<br />
  9. 9. Implementation of the Priority Rule<br />What illustrates priority most obviously?<br />
  10. 10. Implementation of the Priority Rule<br />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<br />
  11. 11. Ensuring Robust Results<br /><ul><li>86 Roundabout entries
  12. 12. 11,000 minutes of capacity operation
  13. 13. 500,000 vehicles observed
  14. 14. 1427 injury accidents studied
  15. 15. 431 junction years of accident data
  16. 16. Over 5 years of accident data at each site
  17. 17. Research duration 10 – 12 years
  18. 18. Equivalent current cost of </li></ul>approximately $20 million (US)<br />
  19. 19. Research Into Capacity Relationships<br />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<br />
  20. 20. Research Into Capacity Relationships<br />Numerous researched equations were used to build the now world renowned International Empirical Methodology <br />
  21. 21. International Validation<br />The Empirical Methodology has been employed in over 90 countries for more than three decades by…<br /><ul><li>National Governments in their Transportation Guidelines
  22. 22. Universities to teach Roundabout Engineering
  23. 23. Multi-national organisations for accurate results
  24. 24. Large and small Consultancies for Design and Analysis</li></li></ul><li>Mike Hutt<br />mhutt@trl.co.uk<br />+44 (0)7786 154 010<br />www.trl.co.uk<br />Any Questions?<br />

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