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Corridor Section: NE 14 th Avenue to NE 33 rd Avenue

By Sultan Alashari Saad Almutairi Salim Mayberry Chawalit Tipagornwong CE 450/550 6/11/12. Corridor Section: NE 14 th Avenue to NE 33 rd Avenue. Outline. NE 20 th Avenue NE 24 th Avenue NE 28 th Avenue NE 31 st Avenue NE 33 rd Avenue.

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Corridor Section: NE 14 th Avenue to NE 33 rd Avenue

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  1. By Sultan Alashari SaadAlmutairi Salim Mayberry ChawalitTipagornwong CE 450/550 6/11/12 Corridor Section:NE 14th Avenue to NE 33rd Avenue

  2. Outline • NE 20th Avenue • NE 24th Avenue • NE 28th Avenue • NE 31st Avenue • NE 33rd Avenue

  3. Elements of All Intersections

  4. Existing Conditions • NE Sandy Boulevard and NE 20th Avenue • Major (Sandy Blvd) • -AADT of 21,466 vpd in 2004 • -4 lanes • Minor(20thave): • 2 lanes + 1 left turn • No intersection lighting • 2 bus stops • Left turn prohibited for the westbound and eastbound approaches.

  5. Collision Diagrams • Overrepresented crashes are Angle Crashes. • Cause : disregarded traffic signal. • Mostly PDO

  6. HSM / Suggested improvement • Base condition • CMF = 0.79 • Predicted Crashes 5.1 per year • Proposed design A: • Lighting the intersection (CMF = 0.72) • Predicted Crashes 4.6 per year • Proposed design B: • Implement automated red light running enforcement cameras • CMF = 0.75 • CMF (clearing house website)

  7. Existing Conditions • NE Sandy Boulevard and NE 24th Avenue • Other roads: NE Irving & NE Hoyt • Major Road: NE Sandy Boulevard • AADT of 22, 628 vpd in 2003 • 4 lanes • 2 Bus stops • Left turn lanes only on northeast leg of road • Minor road: NE 24th Avenue • AADT of 6,659 vpd in 2003 • 2 lanes • No turning lanes

  8. Collision Diagrams • Most Frequently Crash Type: Angle, Rear • Severity/Inj: PDO • Most crashes are between 9am – Noon • On Wednesday, Thursday • Age: 25 – 34 • Cause: Disregarded RAG

  9. HSM Intersection Analysis and Countermeasure • Proposed Design A • Change type of left-turn phasing of northbound leg of NE 24th Ave. from its Permissive to Protected • CMFcombined: 0.89 to 0.84 • Crashes : 5.6 to 5.3 per year • Proposed Design B • Implement 2 automated speed enforcement cameras on 2 legs of NE Sandy Boulevard • CMFcombined: 0.89 to 0.10

  10. NE Sandy Boulevard and NE 28th Avenue Existing Condition • Major Road • AADT of 21,773 vpd in 2003 • Left turn lanes on both directions • 2 bus stops • Minor road • “ No Turn on Red” for southbound

  11. NE Sandy Boulevard and NE 28th Avenue Crash data • Total 14 crashes • Friday • 9 crashes daytime • Severity level 3 Inj -B 9 PDO • Collision type 7 Turning (4: Not ROW) 4 Rear (4: Too close)

  12. NE Sandy Boulevard and NE 28th Avenue HSM Analysis and Countermeasure Proposed Design - Change left turn signal phrasing on Sandy Blvd. from Permissive / Protected to Protected • CMF (combined): 0.79 to 0.75 • Predicted crash: 4.2 to 4.0 per year

  13. Existing Conditions • NE Sandy Boulevard and NE 31st Avenue • Major road: Sandy Boulevard • Not signalized • AADT of 28,572 vpd in 2004 • 4 lanes • No intersection lighting • 2 bus stops • Minor road: NE 31st Avenue • AADT of 4,272 vpd in 2004 • 2 lanes • Stop signs

  14. Collision Diagrams • Overrepresented crashes were Turn (6/ 9 crashes) • Majority PDO (16/ 20 crashes) • Cause • Did not yield right of way (4/9 crashes) • Other (4/9 crashes) • 1 PED Crash

  15. HSM / Suggested improvement • Base condition: • Not signalized, so it was Hard to use HSM spread sheet. • CMF = 1 • Predicted crashes = 6.1 per year • Proposed design: • Prohibit left-turning on all approaches. • CMF = 0.36 (CMF Clearinghouse)

  16. Existing Conditions (Shared) • NE Sandy Boulevard and NE 33rd Avenue • Major (NE Sandy Blvd) • AADT of 21,466 vpd in 2004 • 4 lanes • 2 bus stops • Minor (NE 33rd Ave): • AADT of 11,763 vpd in 2004 • 2 lanes • 1 left turn • No intersection lighting

  17. Collision Diagrams • Most Frequently Crash Type: Turning • Severity/Inj: PDO • Most crashes are between Noon – 3PM • On Saturday • Age: 35 – 44, 55-64 • Cause: No Yield ROW

  18. HSM / Suggested improvement Proposed Design - Change left turn signal phrasing on NE Sandy Blvd. from Permissive to Protected -CMF (combined): 0.86 to 0.79 -Predicted crash: 8.0 to 7.5 per year

  19. Conclusions • Lighting the intersection of NE Sandy Blvd and NE 20th Ave • Implement automated red light running enforcement cameras on NE Sandy Blvd at NE Sandy Blvd and NE 24th Ave • Change type of left-turn phasing of northbound leg’s from Permissive to Protected on NE Sandy Blvd and NE 24th Ave • Implement 2 automated speed enforcement cameras on 2 legs of NE Sandy Blvd at NE Sandy and NE 24th Ave

  20. Conclusions • Change left turn signal phrasing on NE Sandy Blvd from Permissive / Protected to Protected at NE Sandy Blvd and NE 28th Ave • Prohibit left-turning on all approaches at NE Sandy Blvd and NE 31st Ave • Change left turn signal phrasing on Sandy Blvd. from Permissive to Protected at NE Sandy Blvd and NE 33rd Ave

  21. Questions

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