conducted by: tyler womble. “a place where two or more roads meet, especially when at least one...
DESCRIPTION
Developed 1963 in England 1990 first use in U.S. was Las Vegas 3,700 throughout the U.S. (As of December 2013) Despised throughout the U.S. by drivers RoundaboutsTRANSCRIPT
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Conducted by: Tyler Womble
Roundabouts Vs. Traffic Signals
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“A place where two or more roads meet, especially when at least one is a major highway”
Can be regulated by:• Stop Signs• Traffic Signals• Roundabouts
Intersections
http://forum.skyscraperpage.com/A roundabout located in Germany.
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• Developed 1963 in England• 1990 first use in U.S. was Las Vegas• 3,700 throughout the U.S. (As of December
2013)• Despised throughout the U.S. by drivers
Roundabouts
http://www.gtcmpo.org/resources/topics/roundabouts.htm
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• “The supervision of the movement of people, goods, or vehicles to ensure efficiency and safety”
• Developed in 1868 in England• First use in U.S. was 1910• Pedestrian crossing signs appeared in 1952
in New York
Traffic Signals
http://phys.org/news/
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• Roundabouts Vs. Traffic Signals• Subcategories:• Construction• Safety• Efficiency• Design• Ease of Navigation• Maintenance Costs
Point of Disagreement
http://www.fcgov.com/engineering/vsi.php
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Public Perception - Roundabouts
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Roundabouts - Construction• Cheaper construction costs than signalized
intersection• Causes shut-down of entire intersection• Geometry is extremely important• Extremely low injury rate• Landscaping
http://www.signalscv.com/archives/107270/
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• A little more expensive than roundabout• 1.4 million compared to 1.35 million• Intersection can remain open during final
stages• Electrical devices, sensors, and equipment
must be installed• Pedestrian stoplights
Signals - Construction
http://www.icollector.com/Give-Em-A-Brake-Sign_i14446930
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• 2.6 times more likely to collide than at a signal
• Injury causing collisions same as signals• .04 pedestrian collisions per roundabout per
year• 1 cyclist collision every 14 years per
roundabout
Roundabouts - Safety
http://www.wpclipart.com/
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• 3 times more likely to be killed than while at roundabout
• Injury causing collisions same as roundabouts
• .05-.08 pedestrian collisions per year• 1 cyclist collision every nine years per signal
Signals - Safety
http://accident.usattorneys.com/
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• No form of control compared to signals• A new form of traffic control to U.S. drivers• 20% reduction in delays from signals• 56% reduction in vehicle stops
Roundabouts - Efficiency
http://www.reddit.com
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• Green time is adjusted to fit flow of traffic• Easier for drivers to make maneuvers• Pedestrian crossing is adjusted easily• Requirements of drivers is easily identified
Signals - Efficiency
http://www.mylespaul.com
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• Costs less than signals• Designs lacks• Signal timings• Electrical engineering• Signal design• Signal Timings
Roundabouts - Design
http://catimes.net/
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• Warrants are easily listed and described• Geometry is easy to configure• Turn Lanes and protection• Dilemma zones must be avoided
Signals - Design
http://iamtraffic.org/
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• Causes many collisions• Side swipes are frequent• Speed reduction• Drivers must be alert• Drivers must focus
Roundabouts - Navigation
Federal Highway Administration
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• Drivers are comfortable with situation• Green means go, Red means stop• Yellow lights cause driver confusion
Signals - Navigation
http://blog.flair-systems.com/2010/05/intelligent-traffic-light-system.html
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• Reduce maintenance costs • No hardware or electrical maintenance required
• Landscaping• Water Runoff
Roundabouts - Maintenance
http://www.virginiadot.org/
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• Electrical Maintenance Required• Changing of signal times• Greater maintenance cost than roundabouts
Signals - Maintenance
http://www.gopixpic.com/
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• Lost time in design• Driver Education• Construction Crew knowledge
Consequences
http://matherhs.org/
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• More roundabouts to come!• More driver education• Better Results• Community Forums
Events
https://www.nevadadot.com/