Infrastructure Engineering Inc. (IEI) is a fast growing multidiscipline engineering firm with offices in Chicago, Indianapolis, Peoria, Springfield, and New York. Since its inception in 1986, IEI has served both public and private organizations with projects including multi-lane freeway/expressway reconstruction, bridge design, intersection improvements, resurfacing, drainage and utilities improvements, traffic signals, mass transit studies, as well as resident engineering and program management assistance. IEI currently has a staff of over 80 professionals spread across multiple offices.