Introduction Illinois’ 140,131 mile network of state and local roads is the third largest in the nation. Almost 16,400 miles, including 2,169 miles of interstate roads, are under the state’s jurisdiction. Of the 26,548 bridges in Illinois, 8,296 are on the state system. The state highway system is very heavily used. The Illinois highway network carries over 107.9 billion vehicle miles of travel annually. Nearly 65 percent of that traffic is carried by the state highway system that constitutes only 12 percent of the total road miles and only 31 percent of all bridges. The state also has the third largest interstate highway system in the country, including three of the nation’s ten transcontinental routes that carry the most commercial vehicle traffic. Illinois interstate highways account for about 2 percent of all road miles in Illinois but carry 29 percent of all traffic in the state. This For The Record annual report of accomplishments of the Illinois Department of Transportation’s (IDOT) highway improvement program details the improvements made to both the state and local highway systems. The report details the status of each project published in the Proposed Improvements for Illinois Highways FY 2006 and lists projects added to the program and accomplished in addition to those originally published. View the interactive For The Record 2006 Publication Map View the For The Record 2006 Publication Download the For The Record 2006 Publication Adobe Reader is required. Download a free copy of Reader..