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 1400 30 1200 25 1000 20 800 RAB AM 15 Signal AM 600 RAB PM 10 400 Signal PM 5 200 0 0 2015 2030 2015 2030 2015 Control Control Queue Queue Queue Delay Delay (EB) (EB) (SB Off)
Interim Signal Alternative 2015 + Project PM Peak 660
Existing Condition 2015 + Project PM Peak 660
Existing Traffic Signal Condition
Existing Traffic Signal Condition
What About Converting the Existing Intersections?
Roundabout Holman Highway 5/2/2013 11
Design Optimization-Overlay Beverly Manor Holman Highway 5/2/2013 12
Design Optimization-Overview Tighter Radius = Slower Speed, Slower Speeds = Less Merge Distance Req’d Less Downstream Merge Distance Req’d Longer Merge Distance Improved Pedestrian Safety Improved Lane Utilization Improved Improved Entry/View Angle Channelization Separation of Decision Making / Improved Signing and Lane Choice 5/2/2013 13
Design Optimization Improved Entry/View Angle Separation of Decision Making / Improved Signing and Lane Choice 5/2/2013 14
Design Optimization – Off Ramp Tighter Rad = Slower Speed Defined Intersection 125’ merge distance Req’d Movements = Simplified Driver Decisions = Safer Improved Bike Lane Delineation “Built To Deliver” 5/2/2013 15
Design Optimization Improved View Angles (12 deg.) Sends Correct Priority Message Entering Yield to Circulating Traffic “Built To Deliver” 5/2/2013 16
Design Optimization “Built To Deliver” 5/2/2013 17
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 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” 5/2/2013 20
Design Optimization - Challenges Very Short Merge Distance Lane Utilization Truck/Freight Flat Entry Angle Concerns Poor View Angle to Left Priority Confusion / Merge Behavior Entry-Circulating Crashes “Built To Deliver” 5/2/2013 21
Interim Layout
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