Missouri Route 30

Transcription

[music] >>VO: Missouri installed its first Displaced Left Turn (DLT) intersection also known as a Continuous Flow Intersection (CFI), in 2007 in St. Louis County Located in the city of Fenton on Missouri 30 and Summit Drive Missouri DOT rebuilt the intersection to accommodate increased traffic and commercial growth Without improvement, the delay at the existing intersection would limit the area's economic growth potential and hinder continued development on the corridor. >>Jeanne Olubogun, P.E.: One of the things that changed is that several years before that a large commercial development opened up called Gravois Bluffs >>VO: Missouri DOT and local developers instituted a Public-Private Partnership to help meet growing demand Under the agreement, the local developer would fund the project and Missouri DOT performed the analysis and modeling >>Jeanne Olubogun, P.E.: We still were not getting the level of service we wanted so we had a couple of people thinking outside of the box that decided to step out and suggest something It turned out to be a really great thing to help keep traffic moving >>VO: The suggested DLT was the only design evaluated that could handle increasing traffic through to the year 2030 Without improvement, projected delays in 2030 would reach as high as two minutes With the DLT, delay would drop to just 30 seconds >>Jeanne Olubogun, P.E.: We were able to use the Continuous Flow Intersection as a a way to maximize and increase the main line green time while the left turns going to the side street were able to run at the same time >>VO: In addition to operational improvements, the DLT also proved to be a safe option >>Jeanne Olubogun, P.E.: Post opening at our initial one year look at crashes we had very few crashes, the ones that were there were pretty minor rear end type property damage only >>VO: Currently servicing up to 50,000 vehicles a day the DLT at Fenton proved to have several benefits Lower projected future delay per vehicle Accommodating economic development increased corridor capacity for future traffic volumes Safety, and cost when compared to separating the two roads with an interchange The Federal Highway Administration encourages communities and agencies to consider the Displaced Left Turn both to improve the safety and efficiency of existing intersections as well as an option for new intersections For more information about the DLT and other innovative intersection designs please visit safety.fhwa.dot.gov