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Hogan Road/Exit 187 Proposed Improvements

Learn about the history, current conditions, proposed solution, and benefits of the Diverging Diamond Interchange at Exit 187 on Hogan Road. Discover how this innovative interchange design improves safety, reduces congestion, and offers better access for pedestrians and cyclists. Watch informative videos and find out about the next steps in this public project.

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Hogan Road/Exit 187 Proposed Improvements

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  1. Hogan Road/Exit 187 Proposed Improvements Public Informational Preliminary Public Meeting June 9, 2016

  2. Overview • History • Current Conditions • Purpose and Need • Proposed Solution • Diverging Diamond Interchange (DDI) • Benefits at Exit 187 • Videos • Next Steps • Questions and Answers Questions

  3. History • 1960: I-95 Hogan Rd interchange built • 1978: Bangor Mall built, interchange signalized • 1983: Hogan Rd bridge has major widening • 2001: Stillwater Ave interchange built • 2011: Bangor I-95 Corridor Study • Increased Development and Developer Projects • Present: Challenges persist at Hogan Road

  4. Current Conditions - Safety • 94 crashes in 3 years, 72 at the two signals • 36% of crashes involve injuries • Three high crash locations SB Off-Ramp 16 crashes (2011-2013) CRF=3.87 NB Intersection 38 crashes (2011-2013) CRF=1.22 SB Intersection 34 crashes (2011-2013) CRF=1.13

  5. Current Conditions - Congestion • Exit 187 is Maine’s busiest diamond interchange • 12.7 million vehicles annually • 35,000 vehicles per day at Interchange (AADT) • 22,000 AADT on Bridge • Backups onto I-95

  6. Current Conditions – Access • Pedestrian Safety • no sidewalks and no shoulders on bridge Pedestrians in the past have used culverts to cross under I-95

  7. Current Conditions – Bridge Hogan Road Bridge has approximately 10+ years of remaining service life

  8. What City/Town do you live in? • Bangor • Brewer • Veazie • Hampden • Other

  9. What concerns you most about the current interchange? (Three clicks, Click your highest priority first. You can click an answer more than once) • Safety • Congestion • Lack of Bike/Ped Access

  10. Purpose and Need Statement • Solve existing safety, congestion, and access issues by: • Reducing crashes by up to 50%; • Increasing mobility and alleviating congestion to prevent backups onto I-95; • Providing an adequate and safe access for pedestrians and bicyclists; • Utilizing the existing life of the current bridge as much as practicable; and • Minimizing disruptions to businesses and traffic.

  11. Proposed Solution Diverging Diamond Interchange • a.k.a. Double Crossover Diamond • This is the only solution to meet the objectives of the purpose and need.

  12. What is your opinion of the proposed DDI? (One Click) • Strongly Agree • Agree • Somewhat Agree • Neutral • Somewhat Disagree • Disagree • Strongly Disagree

  13. Diverging Diamond Interchange Improves Safety by: • Reducing the number of conflict points • Lowering speeds to minimize crash severity • Making wrong-way entry onto the interstate extremely difficult (Existing Diverging Diamond Interchanges have shown to reduce crashes by approximately 50%)

  14. Diverging Diamond Interchange Improves Mobility and Alleviates Congestion by: • Accommodating high left-turn movements onto and off of I-95 (Off-ramp capacity increased by 50 to 100%) • Reducing delays and preventing backups with a 2-phase traffic signal that has short cycles (Delays reduced by 15 to 60%) • Providing easy U-turns for missed exits

  15. Diverging Diamond Interchange Provides Safe Pedestrian and Bicycle Access by: • Allowing for a protected multi-use path in the bridge median • Pedestrians only have to cross one direction of traffic at a time at intersections

  16. Diverging Diamond Interchange Utilizes the existing life of the current bridge as much as practicable by: • Maintaining the existing width of bridge • Utilizing the existing life of bridge, 10+ years • Supporting future bridge improvements or replacement

  17. Diverging Diamond Interchange Minimizes disruptions to businesses and traffic by: • Needing no additional ROW for adding traffic lanes • Reducing project costs and reducing construction time to one construction season

  18. Diverging Diamond Interchange

  19. Diverging Diamond Interchange Reduced Conflicts MoDOT, DDI: Lessons Learned, May 2010

  20. Conventional Diamond Diverging Diamond

  21. Existing Conflicts Types of Crashes that would disappear with a DDI

  22. Reduced Conflicts with a DDI 50% Crash reduction in existing DDI’s

  23. Signal Phasing

  24. Signal Phasing

  25. Pedestrian/Bicycle Accommodations Shared path in median SHARED PATH THRU LANE THRU LANE THRU LANE THRU LANE THRU LANE

  26. DDI History in U.S. Diverging Diamond Interchange Locations • 66 DDIs built in U.S. since 2009 • 28 states have DDIs built or currently under construction • 17 more states have DDIs in study or design 1st DDI – Springfield, MO (opened June 2009) 15 DDIs currently in MO

  27. DDI Benefits at Exit 187 • Reduces crashes by up to 50% • Increases mobility and alleviates congestion to prevent backups onto I-95 • Provides an adequate and safe access for pedestrians and bicyclists • Utilizes the existing life of the current bridge as much as practicable • Minimizes disruptions to businesses and traffic

  28. Application to Exit 187 Videos USDOT, FHWA (informational video on DDIs)

  29. Videos https://youtu.be/bu-Jqx2LpMo Side By Side https://youtu.be/bWpi7mZE688 Eastbound left and through https://youtu.be/sk89TyRTxhY I-95 Northbound onto Hogan Road Bridge

  30. Next Steps • Municipal and Community support • Pre-construction Engineering (Design – 2016-17) • Another Public Meeting • Construction (2018 or 2019 at the earliest)

  31. Questions and Answers • Please State Name • Additional “Clicker” question after questions

  32. What is your opinion of the proposed DDI? (One Click) • Strongly Agree • Agree • Somewhat Agree • Neutral • Somewhat Disagree • Disagree • Strongly Disagree

  33. How to give us additional input • Project Website • www.mainedot.gov • MySidewalk Interactive Site

  34. Thank you!

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