2C Jaffar: Georgia Section ITE – Technical Tour in England

Georgia Section of ITE
International Technical
Tour in England
September 20-23, 2010
April 11, 2011
Tour Group
• Stephanie Box, E.I.T.
Georgia Institute of Technology
• Naveed Jaffar, P.E., PTOE
Florence & Hutcheson
• Mark Lenters, P.E.
Ourston Roundabout Engineering
• Alek Pochowski, E.I.T.
Georgia Institute of Technology/
Kittelson & Associates, Inc.
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• Steve van De Keere, P.Eng
Region of Waterloo (Canada)
• Scott Zehngraff, P.E.
Georgia DOT
Outline
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Purpose of trip
Transport for London
Highways Agency
London Borough of Ealing
Transport Research Laboratory
England’s Unique Roundabouts
– Oxford “Hamburger” Roundabout
– Hemel Hempstead Magic Roundabout
– Swindon Magic Roundabout
• Lessons Learned
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Purpose
• Gain first-hand knowledge of how transportation
practitioners in England are innovatively addressing:
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Congestion management
Freeway management
Roundabouts
Traffic calming
• Visit with:
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Transport for London
Highways Agency
London Borough of Ealing
Transport Research Laboratory
Transport for London (1)
• Congestion charging in
central London
– Goal is to free space for
non-automobile users
– Keys to successful
implementation
• Signal timing and
optimization in London
– Goal is to improve travel
time reliability
– Largest SCOOT network
in the world
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Transport for London (2)
• Performance and
maintenance
– Performance-based
contracts
• Mayor’s transport
strategy
– Interactive touch screen
display
– Situational awareness
modeling
– Intelligent decision
support
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Highways Agency (1)
• Strategic driver
information program
– Goal is to reduce Killed
and Serious Injuries (KSI)
by 1/3
– Change driver behavior
• National Traffic Control
Centre
– Journey time reliability
– Six key stages to
operation
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Highways Agency (2)
• Managed Motorways
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Hard –shoulder running
Varying speed limit
Design Considerations
Technology
Operation
• West Midlands
Regional Control
Centre in operation
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London Borough of Ealing (1)
• Bollo Lane/ Gunnersbury Ave
• Replace signal with roundabout
• Hanger Lane Bridge Replacement
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London Borough of Ealing (2)
• Northala Fields
– New park development using spoil from the Wembley
Stadium redevelopment
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London Borough of Ealing (3)
• Hanger Lane Gyratory
• Target Roundabout
– Signalized roundabout
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London Borough of Ealing (4)
• Whitehart Roundabout
– Roundabout cycle paths
• Pitshanger Lane
– Streets for people
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London Transport Tour (1)
• Barclays Cycle Hire
• Inter-active street kiosks
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London Transport Tour (2)
• Walking tour of Southwark: traffic calming
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London Transport Tour (3)
• London Transport Museum
a
Lon
eve
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Transport Research Laboratory (1)
• TRL Overview
• UK Roundabout Research
• Priority Roundabout
Design & Analysis
• Networks of Mixed
Roundabouts
• TRL Facilities Visit
• Partially & Fully Signalized
Roundabouts
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Transport Research Laboratory (2)
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Transport Research Laboratory (3)
• Online adaptive
control of signalized
roundabout
• United States
applicability and
calibration of United
Kingdom roundabout
techniques
• Roundabouts in the
United States
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Oxford Hamburger Roundabout
• Constructed in 2006
• Operates like a signalized
roundabout, but has a
straight-through section
of carriageway for the
major route
• Several more hamburger
roundabouts are planned
for the Oxford area
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Hemel Hempstead Magic Roundabout
• Constructed in 1973
• Consists of six miniroundabouts arranged in
a circle
• Voted second worst
roundabout in the UK
(Swindon was # 1)
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Swindon Magic Roundabout
• Constructed in 1972
• Consists of five miniroundabouts arranged in a
circle
• Number 3 on the list of the
world’s worst junctions
• Anecdotal evidence shows:
– Higher throughput than
any other design for a “flat
junction”
– An impressive safety record
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Lessons Learned (1)
• Political will needed to implement new and innovative
ideas like:
– Congestion Charging
– Managed lanes/hard-shoulder running
• Goals are reliable journey times, not increased travel
speeds
• Congestion charging focused on freeing up space, rather
than reducing the automobile mode share
• Managed lanes schemes have improved capacity and
safety
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Lessons Learned (2)
• Drivers can adapt better than many engineers give them
credit for
• “Over engineer” when implementing a new idea
• Roadway safety can be achieved only partially through
engineering
– Changing driver behavior and education needed as well
• Lots of “‘tools” in the traffic engineering tool box but can
we use them here in the United States?
– Design criteria
– Liability issues
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Lessons Learned (3)
• Roundabouts used extensively in UK since the 1960’s
in many applications:
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Grade separated interchanges
3-6 legs
Multi-lane
Mini-roundabouts
• Many roundabouts have been modified to extend
design life:
– Signalized
– “Hamburger”
– “Magic”
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Lessons Learned (4)
• Pedestrian facilities at roundabouts
– Grade separated under-passes
– Offset mid-block crosswalks
– Overpasses (recommended, but expensive)
• Roundabouts should have balanced volumes
• Keep roundabout design simple
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Contact Information
Stephanie Box, E.I.T.
Graduate Research Assistant
Transportation Systems Engineering
Georgia Institute of Technology
stephanie.box@gatech.edu
Mobile: (678) 938-4588
www.utc.gatech.edu
Naveed Jaffar; P.E., P.T.O.E.
Senior Traffic Engineer
Florence & Hutcheson
njaffar@flohut.com
Phone: (770) 428-0157
Mobile: (404) 375-0292
www.flohut.com
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Alek Pochowski, E.I.
Engineering Associate
Kittelson & Associates, Inc.
apochowski@kittelson.com
Phone: (703) 885-8970
Mobile: (913) 579-3880
www.kittelson.com