Why is MoDOT doing this project?

The almost one mile corridor between westbound ramps at the I-70 and Woods Chapel interchange has experienced large amounts of growth, and currently experiences long delays and congestion because of:

• closely spaced signals are 350 feet apart where desirable spacing is greater than 800 feet,
• weaving traffic patterns with right turns immediately followed by left turns, and
• a lack of capacity as northbound traffic predominantly turns left to I-70 westbound.

 How will this project benefit me? 

MoDOT and the City of Blue Springs have opted to build a “Diverging Diamond Interchange” (DDI) that utilizes the existing bridge width.

A diverging diamond interchange is type of interchange in which the two directions of traffic actually cross to the opposite side. The Federal Highway Administration thoroughly researched the concept and also found a number of benefits including: 

• Fewer conflict points
• Better sight distance
• Reduced speeds
• Simpler signal timing and geometry
• More difficult wrong way entry onto ramps
• Less infrastructure to construct, maintain, and replace
• 50% lower overall project costs compared to the traditional design
• More room for trucks to maneuver
• Shorter construction schedule

 How much will this project cost?

The City of Blue Springs initiated this improvement project and will provide funding. The project has been designed to provide additional capacity without requiring bridge replacement or modification to mainline I-70. Based upon the preliminary plans, the estimated cost is $8.5 million excluding the cost for purchasing right-of-way and any relocation of utilities.  

What’s the construction schedule?

The roadway will continue to provide mobility and access throughout construction. This project will be complete in five phases:

Phase I – Construct relocated South Outer Road (SOR) and new traffic signal, as well as Woods Chapel Road (WCR) south of Valley View Road (VVR).

Phase II – Construct northbound lanes along WCR north of VVR, southbound lanes south of VVR, as well as construction of sidewalk across the I-70 bridge and widening of the I-70 ramps.

Phase III – Construct central portion of WCR and the ramps. Phase IV – Construct southbound lanes on WCR north of SOR and northbound lanes south of SOR.

Phase V – Complete median and island construction.

• Spring 2010 — Complete Final plans
• Summer 2010 — Acquire right-of-way
• Fall to Spring 2011 — Relocate utilities
• Summer 2011 — Start Construction Fall
• 2013 — Project Completion  

How do I learn more?  

The first DDI in the world was built in Versailles, France. The first in the United States was built by MoDOT in Springfield, Mo. MoDOT is also working on a DDI at the I-435 and Front Street exit.

For more information, review the materials listed in the left column. You can also submit a comment, send an e-mail or give us a call. Lend your voice to the transportation process!