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First Diverging Diamond Interchange in the Nation: Enhancing Traffic Flow in Springfield, MO

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donny
19 diapositives · 327 Views · Aug 06, 2014

The Diverging Diamond Interchange (DDI) at I-44 and MO 13 in Springfield, MO, marks a significant innovation in traffic management, aimed at reducing congestion and improving safety. Completed in July 2009 at a cost of $3.2 million, this project effectively addressed common interchange problems, including high left turn percentages and crash rates. The operational effects were notable, with a 24% reduction in accidents and improved public perception, as evidenced by a survey indicating over 95% satisfaction regarding convenience and safety.

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First Diverging Diamond Interchange in the Nation: Enhancing Traffic Flow in Springfield, MO
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  1. “First In the Nation” Diverging Diamond Interchange IS 44 and MO 13 - Springfield, MO Joseph C Rickman, PE, ACTAR District Traffic Engineer MoDOT – Springfield Region

  2. Kansas & I-44, 2008

  3. Kansas & I-44, 2008 Norton Rd. 681 ft’ Evergreen 296 ft’

  4. Basic Interchange Problems • Congestion • 15-30% left turns • 10-15% HGV • Closely spaced signals • Crashes • Pedestrian Accommodations

  5. Congestion

  6. Concept Design of the DDI

  7. VISSIM Model

  8. inVISION Studios Simulation

  9. Opening Day – June 21st, 2009

  10. Opening Day Signal Timing • Interchange still under construction • Norton Rd Autoscope System failed • No Evergreen Rd signals due to construction • Time Travels run each plan throughout the day

  11. Finishing the DDI • Islands installed • Pedestrian buttons added • Temporary signals moved from gores • Permanent advanced signals added in islands

  12. July 7th, 2009

  13. Pedestrian Access

  14. Pedestrian Access

  15. Project Timeline • Construction began: January 16th, 2009 • Lane restrictions on bridge: March 4th, 2009 • Traffic moved to DDI: June 21st, 2009 • Construction completed: July 7th, 2009 • Last modification: August 25th, 2009 • Final cost: $3.2 million

  16. Operational Effects Superload on March 3, 2010

  17. Operational Effects • Accidents • Total Reduction 24% (50% between ramps) • Injury Reduction 50% • Congestion removed on the bridge • Consultant Performance Evaluation (HDR)

  18. Public Perception • MoDOT survey of 8 zip codes • 400 sent, 75 returned • The Right Solution – 89.4% • More Convenient – 95.1% • Less Congested – 95.2% • Safer – 96.7%

  19. Questions? Joseph C Rickman, PE, ACTAR District Traffic Engineer 417-895-7635 Joseph.Rickman@modot.mo.gov