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Rotaries to Roundabouts in Massachusetts

Rotaries to Roundabouts in Massachusetts. Andy Paul MassDOT HQ – Traffic Operations Joe Frawley MassDOT District 3 – Traffic Engineer. Existing Rotaries. More than 100 existing rotaries. WEYMOUTH – ROUTE 3 / UNION STREET. HUDSON – ROUTE 62 / ROUTE 85. Existing Rotaries.

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Rotaries to Roundabouts in Massachusetts

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  1. Rotaries to Roundaboutsin Massachusetts Andy Paul MassDOT HQ – Traffic Operations Joe Frawley MassDOT District 3 – Traffic Engineer

  2. Existing Rotaries More than 100 existing rotaries WEYMOUTH – ROUTE 3 / UNION STREET HUDSON – ROUTE 62 / ROUTE 85

  3. Existing Rotaries BOSTON – COLUMBIA ROAD / MORRISSEY BLVD. / WILLAM J. DAY BLVD. EVERETT – ROUTE 99 (BROADWAY) / MAIN STREET

  4. Problems with Rotaries • Geometric deficiencies • Wide circulatory roadway • Large circle radius • Entry angle • Crashes resulting from deficiencies • Rear-end • Sideswipe, same direction • High rate of injury crashes • Negative public perception

  5. Example Rotary • Worcester – Newton Square WIDE CIRCULATORY ROADWAY HIGH APPROACH SPEEDS CAUSED BY LACK OF DEFLECTION NO LANE-USE MARKINGS ON MULTI-LANE APPROACHES

  6. How to Improve a Rotary • Low Cost, Short Term • Upgrading Signs and Pavement Markings • Moderate Cost, Medium Term • Modify Approach Geometry (examples: splitter island, entry width, exit radius) • Higher Cost, Long Term • Reconstruct as a Roundabout

  7. Low Cost • Revere – Brown Circle • Population: 51,693 • Average of 48 Crashes per Year • 3 Truck Rollovers in 3 Years • Entering ADT = 75,000 Crash Rate

  8. Revere Existing Aerial

  9. Revere Existing Aerial NO LANE-USE MARKINGS ON MULTI-LANE APPROACHES WIDE CIRCULATORY ROADWAY NO SPLITTER ISLAND ON APPROACH

  10. Revere • Proposed upgrade of signs and markings

  11. Low Cost • Gardner – Route 2 / Route 68 Interchange • Population: 20,972 • Entering ADT = 25,000 (2005)

  12. Gardner • Birds-Eye View

  13. Gardner Birds-Eye View LARGE CIRCLE RADIUS WIDE CIRCULATORY ROADWAY POOR ENTRY ANGLE

  14. Gardner • Proposed upgrade of signs and markings

  15. Moderate Cost • Greenfield – Interstate 91 / Route 2 / Route 2A Interchange • Population: 17,537 • 39 Crashes from 2005 – 2007 • Entering ADT = 36,000 (2004) • 80% Rear-End Crashes • 44% Injury Crashes Crash Rate

  16. Greenfield • Birds-Eye View

  17. Greenfield • Before LARGE CIRCLE RADIUS WIDE CIRCULATORY ROADWAY POOR ENTRY ANGLE

  18. Greenfield • Concept Plan

  19. Greenfield • Modified approach geometry

  20. Greenfield • Upgraded signs and pavement markings

  21. Moderate Cost • Greenfield – Interstate 91 / Route 2 / Route 2A Interchange • Project Constructed in 2008 • Project Cost: $1.0 million • Governor’s Highway Safety Funds were used for construction

  22. Moderate Cost • Holyoke – Route 202 / Lyman Street • Population: 40,005 • Existing ADT = 10,000 • 75% Rear-End • 25% Injury Crashes Crash Rate

  23. Holyoke • Birds-Eye View

  24. Holyoke • Existing / Proposed

  25. Higher Cost • Worcester – Washington Square • Population: 182,421 • 66 Crashes from 2002 – 2006 • Entering ADT: 36,250 (2000) • 59% Rear-End Crashes • 27% Injury Crashes Crash Rate

  26. Worcester Birds-Eye View

  27. Worcester Birds-Eye View PEDESTRIAN CROSSING TO CENTRAL ISLAND POOR ENTRY ANGLE LARGE CIRCLE RADIUS (R = 300’) NO LANE-USE MARKINGS ON MULTI-LANE APPROACHES

  28. Worcester Reconstructed as a roundabout

  29. Worcester Beginning of Construction

  30. Picture of Completed RDB Worcester After Construction

  31. Higher Cost • Worcester – Washington Square • First multi-lane roundabout in MA • Construction Completed in 2008 • Project Cost: $8.8 million • Included utility relocation and three signalized intersections

  32. How to Improve a Rotary Full reconstruction is not needed for every rotary Examine crash data to determine cause Determine geometric deficiencies In many locations, making improvements to the rotary approaches can significantly improve safety

  33. Thank You • Any Questions? • Contact Information • Andy Paul • MassDOT HQ – Traffic Operations • 617.973.7967 • Andrew.Paul@state.ma.us • Joe Frawley • MassDOT District 3 – Traffic Engineer • 508.929.3916 • Joseph.Frawley@state.ma.us

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