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

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Presentation on theme: "Holman Highway 68 / Highway 1 Roundabout Planning Commission May 14, 2013."— Presentation transcript:

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

2 Congestion

3

4 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 Acceleration from Holman Hwy to southbound Hwy 1 entrance ramp Reduction in crashes and crash severity  Dramatic Emission Reduction - as compared to signal

5 Operations

6 Interim Signal Alternative Project PM Peak

7 Existing Condition Project PM Peak

8 Existing Traffic Signal Condition 250’

9 40 MPH

10 What About Converting the Existing Intersections?

11 Holman Highway 115/2/2013 Roundabout

12 Beverly Manor Holman Highway Design Optimization-Overlay 125/2/2013

13 Tighter Radius = Slower Speed, Slower Speeds = Less Merge Distance Req’d Less Downstream Merge Distance Req’d Improved Pedestrian Safety Improved Entry/View Angle Longer Merge Distance Improved Lane Utilization Separation of Decision Making / Improved Signing and Lane Choice Design Optimization-Overview 135/2/2013 Improved Channelization

14 Improved Entry/View Angle Separation of Decision Making / Improved Signing and Lane Choice Design Optimization 145/2/2013

15 200’ 75’ Tighter Rad = Slower Speed 125’ merge distance Req’d Defined Intersection Movements = Simplified Driver Decisions = Safer Improved Bike Lane Delineation 155/2/2013 Design Optimization – Off Ramp “Built To Deliver”

16 Improved View Angles (12 deg.) Sends Correct Priority Message Entering Yield to Circulating Traffic Design Optimization 165/2/2013“Built To Deliver”

17 Design Optimization 175/2/2013“Built To Deliver”

18 The Timing is Right  Pebble Beach Project Approved  Concept Plan Complete  Stakeholders On-Board  Relinquishment In Process

19 Next Steps  Engineering Design  Project Report Amendment  EIR Addendum  Public Outreach and Education  Construction

20 Design Optimization - Challenges Merging Thru Down- Stream Intersection Un-Defined Intersection Vehicular and Bicyclists Safety Concerns Large RT Radius = Higher Speed 205/2/2013 Longer Merge Distance Lane Choice/Complexity Compressed Decision Making Dist. Difficult to Sign “Built To Deliver”

21 Design Optimization - Challenges Flat Entry Angle 215/2/2013 Very Short Merge Distance Lane Utilization Truck/Freight Concerns Poor View Angle to Left Priority Confusion / Merge Behavior Entry-Circulating Crashes “Built To Deliver”

22 Interim Layout


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