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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. Outline. Kansas Roundabouts (History) High Speed Approach Roundabouts K-68 & Old KC Road – Paola, KS

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kansas high speed approach rural roundabouts

Kansas – High Speed Approach Rural Roundabouts

MoDOT State Traffic &

Safety Conference

May 11, 2007

David Church, P.E.

KDOT, Bureau of Traffic Engineering

outline
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?
kansas roundabouts history
Kansas Roundabouts (History)
  • First modern roundabout in Kansas was installed in 1997
  • Candlewood & Gary (two-collector roads) in Manhattan, KS
kansas roundabouts history4
Kansas Roundabouts (History)
  • Existing – 57
    • 9 on the SHS (16%)
  • Under Constr. – 10
  • Under Design – 20
  • Planned – 17
  • Cancelled - 2
high speed approach rural roundabouts
High Speed ApproachRural Roundabouts
  • Existing – 3
  • Under Design - 2
  • Planned – 1
  • Why install?
    • Safety, Safety …
    • High Crash Loc.
slide6
High Speed Approach Rural Roundabouts

(Paola, Garnett, Florence)

slide8
K-68 & Old K.C. Road

Miami County (North of Paola, KS)

k 68 old kc road
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
slide11
K-68 & Old KC Road

AADT = 6900 vpd (20% trucks)

slide13
K-68 & Old KC Road

(Before and After Crash Data)

slide15
K-68 & Old KC Road

(Long Splitter Islands)

slide21
N. Jct. of US-59 & US-169

Anderson Co. (S. of Garnett, KS)

n jct of us 59 us 169
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
slide23
N. Jct. of US-59 & US-169

(Previous Geometry)

slide25
N. Jct. of US-59 & US-169

AADT = 5845 vpd (20% trucks)

slide30
Rear tire tracks over

central island

Rear tire tracks over outside curb

slide31
US-50 & US-77

Marion Co. (W. of Florence, KS)

us 50 us 77
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
slide34
US-50 & US-77

AADT = 4827 vpd (42% trucks)

thanks for your time and attention
Thanks for your time and attention
  • Questions?
  • Open invitation to field review our roundabouts
  • Happy to give you a tour of these locations
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