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Register Login Login Register About IRTBA The Illinois Road and Transportation Builders Association IRTBA has served as the leading transportation industry trade association in Illinois since 1938. IRTBA member firms design build and maintain the state highways transit systems railways and aviation systems. The core purpose of IRTBA is to advance and promote the transportation design and construction industry in Illinois. On behalf of the 350 member firms we hope you find our site helpful in providing background on our Association as well as answering any questions you have on transportation issues in Illinois.