1. Roundabouts on the Road to Sustainability Presented by Steve Nolen Transportation Solutions, Inc. Redmond, WA http:/www.tsinw.com 425-883-4134

2. Sustainability It can be defined and applied in a variety of ways to the planning, construction, maintenance and operation of all modes of transportation. From consideration of environmental issues in the infrastructure life-cycle cost analysis to carbon footprint assessment in the construction management process, to environmental and social factors being considered in the project design process.

3. SustainablePractices Sustainable practices in public works atr key to satisfying the triple bottom line of social, environmental and economic needs. As such, it is critical for these practices to be incorporated as part of an agency's good business case in the selection, design and management of transportation facilities.

4. The State’s GHG Problem In 2005, transportation generated 47 percent of Washington State’s total atmospheric carbon emissions, in contrast with electricity generation and buildings, which accounted for 20 percent each. Cars and trucks generated 32.3 million metric tons of atmospheric carbon, which was 73 percent of the transportation carbon emissions, and 34 percent of total emissions.

6. State population is projected to grow by 20 percent over that time.

7. The compounding effect of expected population growth and an overall 11 percent GHG reduction is a 25 percent per person GHG reduction.

10. Collisions less frequent / less severe

11. Virtually no time stopped/idling

13. Roundabouts are Safer National Cooperative Highway Research Program (NCHRP) Report 572* indicates roundabouts reduce crashes by 35 percent at intersections where stop signs or signals were previously used for traffic control. *NCHRP Report 572: Roundabouts in the United States. National Cooperative Highway Research Program, TRB, NAS, Washington DC, 2007.

15. Roundabouts reduced

16. collisions of all types by 39%,

17. injury collisions by 76%,

18. fatal and incapacitating collisions by 90%.

20. Roundabouts Eliminate Right Angle Conflicts

21. Better Flow Equals Less Congestion Roundabouts promote a continuous flow of traffic. Unlike intersections with traffic signals, you don’t have to wait for a green light at a roundabout to get through the intersection. Traffic is not required to stop – only yield – so the intersection can handle more traffic in the same amount of time.

23. Low travel speeds – because drivers must yield to traffic before entering a roundabout, they naturally slow down. The few collisions that occur in roundabouts are typically minor with few injuries, since they occur at low speeds of 15 – 20 miles per hour.

25. Study of intersections where roundabouts replaced stop signs:

26. 13-23 percent reduction in vehicle delays

27. Study of intersections where roundabouts replaced traffic signals or stop signs:

28. 89 percent average reduction in vehicle delays

29. 56 percent average reduction in vehicle stops

31. A roundabout may need more property within the actual intersection, but takes up less space on the streets approaching the roundabout.

32. Roundabouts usually require less overall property to build than a signal with turn lanes because traffic doesn’t have to line up and wait for a green light.

33. Roundabouts eliminate hardware, maintenance and electrical costs associated with traffic signals: approximately $5,000 per year.

36. Landscaped areas are opportunity for sustainable storm water managementTime Cost Reduced time spent behind the wheel Collision Costs ATLANTA, May 11, 2011 (UPI) -- U.S. officials say motor vehicle crash deaths cost the country $41 billion a year in medical and work-loss costs.

37. Top 5 ReasonsRoundabouts are Sustainable Roundabouts are often less expensive to build and maintain than other intersection control alternatives. Less congestion means less time spend driving, lower fuel cost and less greenhouse gas Increased safety means lower emergency response, health care and other societal costs. Roundabouts do not specifically require periodic maintenance like traffic signals Power outage? No problem! They still work perfectly.

38. Reason Drivers and Local Officials Should like Roundabouts No need for Red Light Cameras