Roundabouts  Emissions

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Sources of Greenhouse Gases. 82 % of US produced Greenhouse gases is from combustion of fossil fuels (coal, petroleum products and natural gas)Transportation is the largest CO2 producing category, followed by industry, residential and commercial.Source: Energy Information Administration, National

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Roundabouts Emissions

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1. Roundabouts & Emissions

2. Sources of Greenhouse Gases 82 % of US produced Greenhouse gases is from combustion of fossil fuels (coal, petroleum products and natural gas) Transportation is the largest CO2 producing category, followed by industry, residential and commercial. Source: Energy Information Administration, National Energy Information Center, Washington, D.C. http://www.eia.doe.gov/bookshelf/brochures/greenhouse/Chapter1.htm

4. Carbon Dioxide vs. Production type

5. Vehicular Emissions Dependent upon Total amount of traffic (number of vehicles using the roads) and congestion Intersection control type (signalized, stop signs, yield, or roundabouts) Driving pattern (driver habits) Vehicular characteristics (gasoline, diesel or hybrid cars and trucks)

6. Modern Roundabouts A Way to Reduce Both Congestion and Emissions

7. What is a Roundabout? NOT a circle Roundabouts are smaller Low speeds (15-20 MPH) Entering vehicles always must yield Entrances are angled to force vehicles to slow down Pedestrian crosswalks are before roundabout entrance.

8. Traffic Circle vs Roundabout

9. Anatomy of a Roundabout

10. Roundabouts In General Safer More efficient Pretty Improved access and circulation Better for pedestrians Smaller carbon footprint

11. Small

12. Large and Busy Note the spectacular fountain.Note the spectacular fountain.

13. Plain

14. Pretty

15. Unique

16. Unusual Cape Coral, FL

17. Roundabouts are Safer Fewer conflicts points Lower Speeds The reasons roundabouts are safer.The reasons roundabouts are safer.

18. Vehicle Conflict Points

19. Conflict Points: Pedestrian/Vehicle

20. Based on an Australia study from their national roundabout standards. Only comparison I know of. Note the low crash rates for one lane roundabouts. Two lanes are higher because of illegal lane changing.Based on an Australia study from their national roundabout standards. Only comparison I know of. Note the low crash rates for one lane roundabouts. Two lanes are higher because of illegal lane changing.

21. No lost time at roundabouts from the yellow and all red time that you sit and wait at signals

22. Efficiency Comparison Intersection of CR520 & Phalanx Rd Monmouth County 2002 Corridor Study 2002 findings: A.M. (65 sec), P.M. (94 sec) 2010 predictions: A.M. (146 sec), P.M. (160 sec) Proposed Roundabout (2008 proposal) A.M. (9.8 sec), P.M. (10.1 sec)

23. Phalanx Roundabout without right turn slip lane

24. Fewer Lanes Needed

25. Pedestrians Crossings

26. Greenhouse Gases Fewer gases, smaller carbon footprint Less idling Less pollution Smaller carbon footprint No electricity Almost no steel, electronics for signals, etc. Less maintenance

27. Mountpelier, VT Roundabout at US2/US302 Intersection Study Three legged one-lane roundabout, near capacity compared to the signalized intersection. Roundabout reduces fuel consumption by 929 gallons per day or about 440,000 gallons of fuel per year. 19.57 pounds CO2 produced per gallon of gasoline burned. Roundabout reduces CO2 by 4,300 Tons per year.

28. Reference: Modern Roundabouts, Global Warming and Emissions Reductions By Tony Redington, New Hampshire, Office of Environmental Protection

29. NY State Study Roundabout vs. Signalized intersection

30. Roundabout Acceptance Public acceptance survey, US Roundabouts, NCHRP 264 Before construction: 68 % oppose roundabouts After construction: 73 % favor roundabouts

31. The End

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