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Route 141 at I-44 Improvement Design-Build Project

Setting girders for the flyover ramp from 141 to I-44

Crews set girders over the railroad and north outer road for the new flyover ramp between southbound Route 141 and eastbound I-44. For more photos on the project, please visit our Flickr page.

Please click here for contractor information

To subscribe to e-mail updates on the project, please click here.

For updated details on driving through the new ThrU Turns, please click here.

What is the problem?

The interchange of I-44 and Route 141 is exceptionally crowded during morning and evening commutes.  With several major arterials, including Vance, leading to Route 141 near I-44, the roadway remains exceptionally congested.

Route 141 Fact Sheet


What is the  current situation?

Overall project view (pdf | jpg)

Route 141 at Vance Road (pdf | jpg)

Route 141 at I-44 (pdf | jpg)

Construction on this project will continue until June 2018.

Currently, crews are working on constructing the new loop ramps on the east and west side of Route 141, the new flyover ramp from southbound Route 141 to eastbound I-44 and the bridge that runs between the loop ramps and the interstate ramps.  e ThrU Turns.  For more details on the closure and detour, please click here.

In February 2017, MoDOT relocated the Park and Ride lot from the west side of Route 141 to the east side.  Details on the relocation are here.

In January 2016, The Missouri Highways and Transportation Commission selected Pace Construction and its partners as the team with the project which provides the best apparent value for this project. 

One of the major goals of the project is to improve how efficiently traffic flows between I-44 and Route 141.  In addition, the department is looking to improve how effiently traffic in the area moves through to Vance.

The project selected as the apparent best value constructs a flyover ramp from southbound Route 141 to eastbound I-44 and makes significant interchange improvements for northbound and southbound Route 141 to westbound I-44.  There will also be improved drainage to reduce flash flooding around the interchange.

In addition, the project will improve left turns to Marshall and Vance Road using signalized ThrU Turns. In a ThrU Turn, drivers pass the roadway and loop to an outside lane at the signal to make the turn onto the roadway.  This means less time waiting at a signal during peak traffic periods and improves the flow of traffic.  According to Federal Highway studies, this type on intersection reduces crashes by nearly 40 percent, making it much safer.


Pace’s proposal included:

  • A flyover ramp from southbound Route 141 to eastbound I-44
  • Updated north outer road system with improved access between northbound and southbound Route 141 and westbound I-44
  • A relocated Park and Ride lot
  • Improved drainage to reduce the possibility of flash flooding
  • Signalized ThrU Turns at Vance and Marshall Roads to improve flow of traffic turning left

Most of the construction will take place during non-peak traffic hours, so it should not impact rush hours through the area significantly.  There are no long-term closures scheduled for either Route 141 or I-44.


What are the goals for the project?

  • Deliver the project within the program budget of $25 million.
  • Maximize mobility on Route 141 and improve efficiency at the I-44 interchange and Vance Road intersection.
  • Deliver the project in a manner which demonstrates the importance of safety.
  • Provide a quality project resulting in a long-lasting transportation facility that minimizes future maintenance.
  • Deliver the project using a diverse workforce.
  • Complete the project by July 15, 2018.


What is the timeline for the project?

Construction begins June 2016
Northbound Route 141 connection to North Outer Road closed January – March 2017
Southbound Route 141 connection to North Outer Road closed March – June 2017
Relocate Park and Ride March 2017
Switch traffic to ThrU Turns Spring 2017
Vance intersection complete August 2017
Interchange Completion June 2018

The schedule is subject to change.

What are the construction impacts?

Construction impacts are projected to be fairly limited.  Most of the work on Route 141 will take place between 9 a.m. and 3 p.m. or between 6 p.m. and 5 a.m. The work on the north outer road portions of the project will experience the most impact to traffic, but this will not significantly impact traffic on Route 141 or I-44.  There are two closures on the outer road, each for three months, which will require a detour.


What are ThrU Turns?

ThrU Turns are a type of signalized intersection used in urban areas.  With a ThrU Turn drivers pass through the intersection and make a U-turn at a signalized median crossover. After making their U-turn, they can get into the right-most lane and make a turn.  Please view the brochure to see more:

Making it ThrU a ThrU Turn



Community Involvement Group presentationsNew

MoDOT has established a Community Involvement Group, where the department is reaching out to community leaders impacted by the project.  The intent of the group is to be one avenue of sharing information, and allowing these leaders to share the information with their constituents or employees.

The following information has been shared to the group:



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