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

“First In the Nation”

Diverging Diamond Interchange

IS 44 and MO 13 - Springfield, MO

Joseph C Rickman, PE, ACTARDistrict Traffic Engineer

MoDOT – Springfield Region

Kansas & I-44, 2008

Kansas & I-44, 2008

Norton Rd. 681 ft’

Evergreen 296 ft’

Basic Interchange Problems

Congestion15-30% left turns10-15% HGVClosely spaced signals

Crashes Pedestrian

Accommodations

Congestion

Concept Design of the DDI

VISSIM Model

inVISION Studios Simulation

Opening Day – June 21st, 2009

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

Finishing the DDI

Islands installed Pedestrian buttons added Temporary signals moved from gores Permanent advanced signals added in

islands

July 7th, 2009

Pedestrian Access

Pedestrian Access

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

Operational EffectsSuperload on March 3, 2010

Operational Effects

AccidentsTotal Reduction 24% (50% between ramps)Injury Reduction 50%

Congestion removed on the bridge Consultant Performance Evaluation

(HDR)

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%

Questions?

Joseph C Rickman, PE, ACTAR District Traffic Engineer

[email protected]