Purpose & Need

The I-270 North Project is the next step toward improvements along interstate 270 from I-70 on the west to the Chain of Rocks Bridge on the east. This follows the completed I-270 North Environmental Assessment (EA) that addressed impacts of congestion, safety, and mobility, as well as accessibility and aging infrastructure, along I-270. The Federal Highway Administration (FHWA) determined that the Preferred Alternative for the I-270 North EA will have no significant impact on the area. This meant the Missouri Department of Transportation (MoDOT) was able to move to the next step for improving I-270.

Traffic Congestion

I-270 North is one of the heaviest travelled roads in Missouri. On average over 140,000 vehicles travel on I-270 North each day (Average Daily Traffic). I-270 North was constructed when traffic volumes were much lower. The I-270 North Project will improve mobility on the mainline, at the interchanges, and on the outer roads. The redesign and reconstruction of I-270 North will reduce traffic congestion faced by local users and interstate travelers.

Traffic congestion on I-270.
Traffic congestion on I-270.
Traffic congestion on I-270.

Safety

I-270 North has a higher crash rate than comparable roads in our region. Some crashes can be attributed to traffic congestion, roadway geometrics, and vehicular travel speed differentials. Our project will improve mobility on the corridor and help reduce crashes related to traffic congestion. The project will also reconstruct the corridor and bring it up to modern design standards as opposed to the standards that were in place in the 1960s and 1970s when I-270 was constructed.  Bringing it up to current design standards will also improve safety.

Deteriorating Infrastructure

I-270 is showing its age. Bridges and pavement are breaking down from many years of heavy freight volumes. Traffic signals, signing, drainage structures, and lighting are all deteriorating. The existing infrastructure is breaking down and resulting in emergency maintenance repairs. This project will replace deteriorated infrastructure and ultimately will result in fewer work zones along I-270 for decades to come.

Image showing deteriorating infrastructure
Image showing deteriorating infrastructure
Deteriorating Infrastructure