sustainable roundabouts presented to michigan association of planning in a pecha kucha format
DESCRIPTION
New thinking on how Roundabouts are sustainable from 2010 Michigan Association of PlanningTRANSCRIPT
![Page 1: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/1.jpg)
Intersections: The Axis of Evil
How Roundabouts are a Sustainable Alternative, and When They Make Sense
Evan N. Pratt, PE
All Intelligent Statements by:
Stephen B. Dearing, PE, PTOE
![Page 2: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/2.jpg)
Roadways Are The Most Dangerous
Public Facilities
On The Face Of The Earth
– In the U.S., about 650 PEOPLE DIE each week.
– Same as 3 Plane Crashes…
–EACH WEEK !?!
![Page 3: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/3.jpg)
SOCIAL: National Crash Statistics
All Reported
Intersection
Fatalities
Intersection
Injuries
Intersections
THEREAL AXIS OF EVIL
![Page 4: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/4.jpg)
ALTERNATIVES ANALYSIS
GOAL: TRIPLE BOTTOM LINE
• Social – Improve Safety AND Mobility for all, Delays
• Financial – Construction and Land Cost, Cost of delays
• Environmental – Air pollution, impervious
• THERE IS NO PERFECT ALTERNATIVE!
![Page 5: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/5.jpg)
THE PROBLEM:
Too Many DogsIn Cars
![Page 6: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/6.jpg)
100 Yrs. CONVENTIONAL WISDOM?MORE LANES SHOULD MOVE MORE CARS?
SUSTAINABLE??
WE CAN DO BETTER!!
![Page 7: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/7.jpg)
THESE look fun…
![Page 8: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/8.jpg)
TO PARAPHRASE
“The…problems…we have created cannot be solved using the same thinking we used to create them..”
SO WHAT ARE THE NEW IDEAS?
![Page 9: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/9.jpg)
TYPICAL ROUNDABOUT RETROFIT
![Page 10: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/10.jpg)
CASE STUDY: US-23/THOMPSON RD Roundabouts vs. Traditional
FINANCIAL: Can Save $8,000,000 of OUR $$• Highest value/cost ratio• 75% Less Construction $$, no ROW • Less crashes, Less Delays = Less cost
SOCIAL: (Less Death is always Good)• 90% Reduction in Fatalities & 76% Reduction in Crashes• Pedestrian refuge• Dramatic LOS Improved: A vs. C in 2025 = 30 sec/vehicle
ENVIRONMENTAL: (Breathing is also Good)• Least delay=Less Greenhouse Gasses• Less pavement (not always the case)
![Page 11: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/11.jpg)
0.0
2.0
4.0
6.0
8.0
10.0
TOT INJ PDO
CRASH TYPE
CR
AS
H F
RE
Q.
Before Roundabouts
After Roundabouts
ALTERNATIVES -- SAFETY:Average annual crash frequencies at 11 U.S. intersections
converted to roundabouts
- FHWA Roundabout Guidelines
![Page 12: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/12.jpg)
WHERE TO CONSIDER RAB’s
• Capacity problems
• Safety problems
• ROW or other constraints on more lanes
• Large left turn turning movements
![Page 13: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/13.jpg)
SOCIAL: #1 CONCERN = PEDS•COMPARE TO EXISTING•2 COUNTERINTUITIVE POINTS
![Page 14: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/14.jpg)
SOCIAL: Thwarting the Axis of Evil
Less Conflict Points = LESS DEATH
![Page 15: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/15.jpg)
Environmental and Social Before – Ashley, NC
![Page 16: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/16.jpg)
ENVIRONMENTAL AND SOCIAL After – Ashley, NC
![Page 17: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/17.jpg)
![Page 18: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/18.jpg)
SOCIAL: PEDESTRIANS, THE #1 CONCERN
INNOVATION FOR LARGER RAB’s: THE HAWK SIGNAL
![Page 19: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/19.jpg)
SOCIAL: Driver’s view of Ped Actuated HAWK Signal in West Bloomfield Township
![Page 20: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/20.jpg)
WE CAN DO BETTER!!
![Page 21: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/21.jpg)
$25 to $30 M $12 to $15 M
FINANCIAL-CONSTRUCTION-LAND-TIME
O/M: -SIGNALS-PAVEMENT
Diverging Diamond
![Page 22: Sustainable Roundabouts presented to Michigan Association of Planning in a Pecha Kucha format](https://reader036.vdocuments.us/reader036/viewer/2022070319/5582a599d8b42a94688b553d/html5/thumbnails/22.jpg)
QUESTIONS??
Placemaking in a Roundabout by a hospital in
Bahrain