Kansas High Speed Approach Rural Roundabouts

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Kansas High Speed Approach Rural Roundabouts

• MoDOT State Traffic
• Safety Conference
• May 11, 2007

David Church, P.E. KDOT, Bureau of Traffic
Engineering
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Outline

• Kansas Roundabouts (History)
• High Speed Approach Roundabouts
• K-68 Old KC Road Paola, KS
• N. Jct. of US-59 US-169 Garnett, KS
• US-50 US-77 Florence, KS
• Future High Speed Approach Rural Roundabouts
• Questions?

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Kansas Roundabouts (History)

• First modern roundabout in Kansas was installed
  in 1997
• Candlewood Gary (two-collector roads) in
  Manhattan, KS

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Kansas Roundabouts (History)

• Existing 57
• 9 on the SHS (16)
• Under Constr. 10
• Under Design 20
• Planned 17
• Cancelled - 2

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High Speed ApproachRural Roundabouts

• Existing 3
• Under Design - 2
• Planned 1
• Why install?
• Safety, Safety
• High Crash Loc.

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High Speed Approach Rural Roundabouts (Paola,
Garnett, Florence)
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K-68 Old K.C. Road Miami County (North of
Paola, KS)
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K-68 Old KC Road

• Two way stop
• 1996 identified as a high crash location
• Converted to 4-way Stop in 1998 (temp).
• Roundabout opened in November 2001
• Five legs / Concrete
• Cost 2.5 million

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K-68 Old KC Road AADT 6900 vpd (20 trucks)
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K-68 Old KC Road
(Before and After Crash Data)

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K-68 Old KC Road (Long Splitter Islands)
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N. Jct. of US-59 US-169 Anderson Co. (S. of
Garnett, KS)
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N. Jct. of US-59 US-169

• Three leg braided intersection
• 2001 identified as a high crash location
• Roundabout opened in April 2006
• No known crashes
• Three legs / Concrete
• Cost 2.4 million

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N. Jct. of US-59 US-169 (Previous Geometry)
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N. Jct. of US-59 US-169 AADT 5845 vpd (20
trucks)
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Rear tire tracks over central island
Rear tire tracks over outside curb
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US-50 US-77 Marion Co. (W. of Florence, KS)
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US-50 US-77

• Two way stop
• High crash location
• Converted to 4-way Stop (temp).
• Roundabout opened in September 2006
• One roll-over crash
• Five legs / concrete
• Cost 3.2 million

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US-50 US-77 AADT 4827 vpd (42 trucks)
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Future High Speed Approach Rural Roundabouts
(Arkansas City, Fredonia, Riverton)
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2008 National Roundabout Conference in Kansas City
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Thanks for your time and attention

• Questions?
• Open invitation to field review our roundabouts
• Happy to give you a tour of these locations