SLIDE 1
Holman Highway 68 / Highway 1 Roundabout
Planning Commission May 14, 2013
Holman Highway 68 / Highway 1 Roundabout Planning Commission May - - PowerPoint PPT Presentation
Holman Highway 68 / Highway 1 Roundabout Planning Commission May - - PowerPoint PPT Presentation
Holman Highway 68 / Highway 1 Roundabout Planning Commission May 14, 2013 Congestion Roundabout Project Need Long Traffic Qs and excessive delay on E/B Holman Hwy 68 Qs extend well beyond CHOMP Impact to public safety / access
SLIDE 2
SLIDE 3
SLIDE 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
SLIDE 5
Operations
5 10 15 20 25 30 2015 Control Delay 2030 Control Delay RAB AM Signal AM RAB PM Signal PM 200 400 600 800 1000 1200 1400 2015 Queue (EB) 2030 Queue (EB) 2015 Queue (SB Off)
SLIDE 6
Interim Signal Alternative 2015 + Project PM Peak
660
SLIDE 7
Existing Condition 2015 + Project PM Peak
660
SLIDE 8
Existing Traffic Signal Condition
SLIDE 9
Existing Traffic Signal Condition
SLIDE 10
What About Converting the Existing Intersections?
SLIDE 11
Holman Highway
11 5/2/2013
Roundabout
SLIDE 12
Beverly Manor Holman Highway
Design Optimization-Overlay
12 5/2/2013
SLIDE 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
13 5/2/2013
Improved Channelization
SLIDE 14
Improved Entry/View Angle Separation of Decision Making / Improved Signing and Lane Choice
Design Optimization
14 5/2/2013
SLIDE 15
Tighter Rad = Slower Speed 125’ merge distance Req’d Defined Intersection Movements = Simplified Driver Decisions = Safer Improved Bike Lane Delineation 15 5/2/2013
Design Optimization – Off Ramp
“Built To Deliver”
SLIDE 16
Improved View Angles (12 deg.) Sends Correct Priority Message Entering Yield to Circulating Traffic
Design Optimization
16 5/2/2013 “Built To Deliver”
SLIDE 17
Design Optimization
17 5/2/2013 “Built To Deliver”
SLIDE 18
The Timing is Right
Pebble Beach Project Approved Concept Plan Complete Stakeholders On-Board Relinquishment In Process
SLIDE 19
Next Steps
Engineering Design Project Report Amendment EIR Addendum Public Outreach and Education Construction
SLIDE 20
Design Optimization - Challenges
Merging Thru Down- Stream Intersection Un-Defined Intersection Vehicular and Bicyclists Safety Concerns Large RT Radius = Higher Speed
20 5/2/2013
Longer Merge Distance Lane Choice/Complexity Compressed Decision Making Dist. Difficult to Sign
“Built To Deliver”
SLIDE 21
Design Optimization - Challenges
Flat Entry Angle
21 5/2/2013
Very Short Merge Distance Lane Utilization Truck/Freight Concerns Poor View Angle to Left Priority Confusion / Merge Behavior Entry-Circulating Crashes
“Built To Deliver”
SLIDE 22