Holman Highway 68 / Highway 1 Roundabout
22
Holman Highway 68 / Highway 1 Roundabout Planning Commission May 14, 2013
description
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 - PowerPoint PPT Presentation
Transcript of 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 68Q’s extend well beyond CHOMPImpact to public safety / access to hospital
Operations / Safety at PB GateAcceleration from Holman Hwy to southbound
Hwy 1 entrance rampReduction in crashes and crash severity
Dramatic Emission Reduction - as compared to signal
Operations
2015
Con
trol D
elay
2030
Con
trol D
elay
0
5
10
15
20
25
30
RAB AMSignal AMRAB PMSignal PM
2015 Queue (EB)
2030 Queue (EB)
2015 Queue
(SB Off)
0
200
400
600
800
1000
1200
1400
Interim Signal Alternative2015 + Project PM Peak
660
315
Existing Condition 2015 + Project PM Peak
660
315
Existing Traffic Signal Condition
250’
Existing Traffic Signal Condition
40 MPH
What About Converting the Existing Intersections?
Holman Highway
115/2/2013
Roundabout
Bev
erly M
anor
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’dDefined 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 IntersectionVehicular 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
