holman highway 68 / highway 1 roundabout planning commission may 14, 2013
TRANSCRIPT
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
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”
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”