In 2008 and 2009, large portions of the I-64 corridor west of St. Louis, Missouri were closed for construction in two separate phases that allowed for an accelerated construction timeline. The connectivity of the regional road network made the full closure of portions of the interstate possible without causing large increases in travel times or number of crashes. Missouri Department of Transportation (MoDOT) used an innovative set of tools, including alternative route mapping, in order to maintain high levels of customer satisfaction and public awareness of the project both before and during the closure.
- By diverting 98,000 to 120,000 vehicles daily to alternative routes for two years, the impact costs over the normal operational state were $101.5 million.
- Had a partial closure system been used, construction would have taken six to eight years and impact costs would have been between $147 million and $188.3 million (present value).
- Assuming construction material costs remained consistent with inflation, the accelerated construction resulted in savings of between $93 million and $187 million.
(Our website has many links to other organizations. While we offer these electronic linkages for your convenience in accessing transportation-related information, please be aware that when you exit our website, the privacy and accessibility policies stated on our website may not be the same as that on other websites.)