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Compiled Traffic Safety Project: NE Sandy Boulevard from NE 44 th Avenue to NE 57 th Avenue

Compiled Traffic Safety Project: NE Sandy Boulevard from NE 44 th Avenue to NE 57 th Avenue. Steven Gehrke, Yunemi Jang, Patrick Singleton & Ian Trout CE 450/550: Transportation Safety Analysis 06.11.2012. NE Sandy Boulevard @ NE 45 th Avenue. SHARED INTERSECTION. Crash Analysis.

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Compiled Traffic Safety Project: NE Sandy Boulevard from NE 44 th Avenue to NE 57 th Avenue

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  1. Compiled Traffic Safety Project:NE Sandy Boulevard from NE 44thAvenue to NE 57th Avenue Steven Gehrke, Yunemi Jang, Patrick Singleton & Ian Trout CE 450/550: Transportation Safety Analysis 06.11.2012

  2. NE Sandy Boulevard @NE 45th Avenue SHARED INTERSECTION

  3. Crash Analysis • Frequency: • 9 Crashes (0 F + A, 5 B + C & 4 PDO) • Rate: • 0.19 / MEV (Critical Rate = 0.33) • Overrepresentation: • Vehicle In-roadway (One Crash) & Older Adult Drivers • Patterns: • Two Rear-end Crashes on WB NE Sandy Blvd at Western Leg of Intersection • Two Rear-end Crashes on EB NE Sandy Blvd at Western Leg of Intersection • Highway Safety Manual: • 3.8 / year (Predicted) and 2.9 / year (Expected) vs. 2.3 / year (Observed) x 2 x 2

  4. Suggested Countermeasures • Suggestion #1 • Remove On-street Parking Space on NB NE 45th Ave • One In-roadway Crash at Location • Suggestion #2 • Install Pedestrian Refuge at Western Leg of Intersection • One Pedestrian-related Crash & Two Pedestrian-involved Crashes • Traffic Calming Response to Slow Traffic along NE Sandy Blvd

  5. NE Sandy Boulevard @NE 47th Avenue STEVEN GEHRKE

  6. Crash Analysis • Frequency: • 22 Crashes (0 F + A, 12 B + C & 10 PDO) • Rate: • 0.47 / MEV (Critical Rate = 0.66) • Overrepresentation: • Turn, Evening Peak, Alley (On-roadway) & Failure to Yield • Patterns: • Turn onto SB NE 47th Ave from WB Sandy Blvd & EB NE Sandy Blvd • Turn into 7-Eleven from EB NE Sandy Blvd & WB NE Sandy Blvd • Turn onto WB Sandy Blvd from NB NE 47th Ave & SB NE 47th Ave • Highway Safety Manual: • 4.7 / year (Predicted) and 4.7 / year (Expected) vs. 5.5 / year (Observed) x 2 x 2 x 2

  7. Suggested Countermeasures • Suggestion #1 • Complete Bike Network at Northern Leg of Intersection • Two bicycle-related crashes on NE 47th Ave • Suggestion #2 • Install Flashing Yellow Left Arrow on WB NE Sandy Blvd, or • Install Protected Only Left Arrow on WB NE Sandy Blvd • Latter Improvement has Reduction of 0.24 Crashes (Predicted) • Suggestion #3 • Install Pedestrian Refuge at Western Leg of Intersection • Twofold Benefit: • Improve Pedestrian Safety • Relocate Access to 7-Eleven farther away from Intersection

  8. NE Sandy Boulevard @NE 50th Avenue YUNEMI JANG

  9. US Post Office Gustav’s Bier Stube Stop sign Bus Stop Half signal s NE Sandy Blvd Taco Time Firestone Complete Auto Care s Speed Limit 35 NE 50th Ave

  10. Crash Analysis • Frequency: • 14 Crashes (1 F + A, 5 B + C & 8 PDO) • Rate: • 0.71 / MEV (Critical Rate = 0.57) • Overrepresentation: • Early Evening (6pm – 9pm), Dark with Light & Following too-closely • Patterns: • Rear-end on EB NE Sandy Blvd • Pedestrian-related, Left Turn onto WB Sandy Blvd from SB NE 50th Ave • Highway Safety Manual: • 1.9 / year (Predicted) and 3.0 / year (Expected) vs. 4.7 / year (Observed)

  11. Suggested Countermeasures • Pedestrian-related Crashes (SB Left Turning Traffic on NE 50th Ave) • Install Traffic Signal along NE Sandy Blvd instead of Stop Control • Install Raised Crosswalk across NE Sandy Blvd • Rear-end Crashes (EB Traffic on NE Sandy Blvd) • Install Advanced Stop Bar at Western Leg of Intersection • Install Additional Pedestrian Crosswalk Warning Signal • Maintenance of Existing Pedestrian Crosswalk (Re-painting)

  12. NE Sandy Boulevard @NE 52nd Avenue IAN TROUT

  13. Crash Analysis • Frequency: • 17 Crashes (0 F + A, 9 B + C & 8 PDO) • Rate: • 0.55 / MEV (Critical Rate = 0.71) • Overrepresentation: • Morning-Peak Period, Non-Resident & Following too-closely • Patterns: • Rear-end on NE Sandy Blvd • Highway Safety Manual: • 7.4 / year (Predicted) and 9.9 / year (Expected) vs. 11.0 / year (Observed) • NE 51st Ave, NE 52nd Ave, NE 54th Ave & NE SandycrestTerrace (2007)

  14. Suggested Countermeasures • Signal Phasing / Timing • All Movements: Increase All-red Clearance Interval • Change Yellow Interval • Signal Characteristics • Use Reflective Backplates for Signals on NE Sandy Blvd • Addition of Signal Heads • Roadway Characteristics • High Friction Pavement

  15. NE Sandy Boulevard @NE 57th Avenue PATRICK SINGLETON

  16. Crash Analysis • Frequency: • 41 Crashes (1 F + A, 26 B + C & 14 PDO) • Top 3 Intersection along NE Sandy Blvd • Rate: • 0.89 / MEV (Critical Rate = 0.67) • Overrepresentation: • Angle, Injury B + C & Disregarding Traffic Signal • Patterns: • Rear-end on NE Sandy Blvd and on NE 57th Ave • Angle on NE Sandy Blvd and NE 57th Ave • Highway Safety Manual: • 3.2 / year (Predicted) and 7.8 / year (Expected) vs. 10.3 / year (Observed) x 5 x 6 C C

  17. Suggested Countermeasures • Previous Changes • Predicted 4.2 / year  3.2 / year • Signal Phasing / Timing • NE 57th Ave LTs: Permissive  Protected/Permissive • NE Sandy Blvd LTs: Protected/Permissive  Protected Only • All Movements: Increase All-red Clearance Interval • Other Suggestions • NE Sandy: Prohibit Right Turns on Red • NE 57th Ave SB Bus Stop: Near-side  Far-side • NE 57th Ave LTs: Increase Length of Left Turn Lanes

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