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Holman Highway 68 / Highway 1 Roundabout

Holman Highway 68 / Highway 1 Roundabout. Planning Commission May 14, 2013. Congestion. Roundabout Project Need. Long Traffic Q’s and excessive delay on E/B Holman Hwy 68 Q’s extend well beyond CHOMP Impact to public safety / access to hospital Operations / Safety at PB Gate

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Holman Highway 68 / Highway 1 Roundabout

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  1. Holman Highway 68 / Highway 1 Roundabout Planning Commission May 14, 2013

  2. Congestion

  3. Roundabout Project Need • Long Traffic Q’s and excessivedelay on E/B Holman Hwy 68 • Q’s extend well beyond CHOMP • Impact to public safety / access to hospital • Operations / Safety at PB Gate • Acceleration from Holman Hwy to southbound Hwy 1 entrance ramp • Reduction in crashes and crash severity • Dramatic Emission Reduction - as compared to signal

  4. Operations

  5. Interim Signal Alternative2015 + Project PM Peak 660 315

  6. Existing Condition 2015 + Project PM Peak 660 315

  7. Existing Traffic Signal Condition 250’

  8. Existing Traffic Signal Condition 40 MPH

  9. What About Converting the Existing Intersections?

  10. Roundabout Holman Highway

  11. Design Optimization-Overlay BeverlyManor Holman Highway

  12. Design Optimization-Overview Tighter Radius = Slower Speed, Slower Speeds = Less Merge Distance Req’d Less Downstream Merge Distance Req’d Improved Pedestrian Safety Longer Merge Distance Improved Lane Utilization Improved Channelization Improved Entry/View Angle Separation of Decision Making / Improved Signing and Lane Choice

  13. Design Optimization Improved Entry/View Angle Separation of Decision Making / Improved Signing and Lane Choice

  14. Design Optimization – Off Ramp Tighter Rad = Slower Speed 125’ merge distance Req’d Defined Intersection Movements = Simplified Driver Decisions = Safer 200’ 75’ Improved Bike Lane Delineation “Built To Deliver”

  15. Design Optimization Improved View Angles (12 deg.) Sends Correct Priority Message Entering Yield to Circulating Traffic “Built To Deliver”

  16. Design Optimization “Built To Deliver”

  17. The Timing is Right • Pebble Beach Project Approved • Concept Plan Complete • Stakeholders On-Board • Relinquishment In Process

  18. Next Steps • Engineering Design • Project Report Amendment • EIR Addendum • Public Outreach and Education • Construction

  19. Design Optimization - Challenges Large RT Radius = Higher Speed Merging Thru Down-Stream Intersection Un-Defined Intersection Vehicular and Bicyclists Safety Concerns Longer Merge Distance Lane Choice/Complexity Compressed Decision Making Dist. Difficult to Sign “Built To Deliver”

  20. Design Optimization - Challenges Very Short Merge Distance Lane Utilization Truck/Freight Concerns Flat Entry Angle Poor View Angle to Left Priority Confusion / Merge Behavior Entry-Circulating Crashes “Built To Deliver”

  21. Interim Layout

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