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

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Presentation transcript:

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

Operations

Interim Signal Alternative Project PM Peak

Existing Condition Project PM Peak

Existing Traffic Signal Condition 250’

40 MPH

What About Converting the Existing Intersections?

Holman Highway 115/2/2013 Roundabout

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

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

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

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”

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

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

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

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

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”

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”

Interim Layout