The first diverging diamond interchange in the St. Louis region is now

open at Dorsett Road and Interstate 270.

To view our Flickr photos of the Dorsett diverging diamond interchange from the air, click on the photo.

The St. Louis chapter of Women in Transportation awarded it's 2010 Innovative Transportation Solutions for the Dorsett diverging diamond interchange.

Dorsett Traffic Cameras

To view the Dorsett DDI cameras, go to www.gatewayguide.com, choose I-270 from the drop down route menu under the camera picture, and choose either I-270 n/o Dorsett, or Dorsett Road at Progress Parkway.

Traffic exiting the interstate at Dorsett may turn right on red at the bottom of the ramps after stopping and yielding to oncoming traffic. Motorists need to anticipate traffic from the proper oncoming roadway. Drivers cannot turn left on red; it is illegal in Missouri.

The city of Maryland Heights opened relocated Old Dorsett Road and Progress Parkway on Friday, December 3, 2010. The project also consists of a right in, right out entrance at the Edward Jones campus.

Driving the Dorsett diverging diamond interchange, click here for the YouTube video

Dorsett Road and the Diverging Diamond Interchange Project History