The American Center of Mobility (ACM) proposed the opening of an autonomous-car test facility in Ypsilanti, MI. The site was once home to a massive factory built by Ford to manufacture bombers during World War II. It includes a 2.5-mile highway loop, a 700-foot curved tunnel, two double overpasses and the same intersections and rotaries one would find on standard public roads.
Companies such as Ford, Hyundai, Toyota, AT&T and Visteon have invested in the facility, giving them access to track time. The Ypsilanti site would be open during all four seasons, regardless of weather, to allow for testing the self-driving vehicles in less-than-ideal conditions.
After the installation of the of a 36-ft wide elliptical shaped tunnel, a washout was caused by an error in directional drilling along the side of the tunnel. A slope failure occurred in the zone of the washed out material and the impacted area required ground improvement. Menard Group USA was contracted to provide a solution – the selected technique was soil mixing.