With the interstate coming to Oklahoma, Oklahoma City's Bill Swisher incorporated Construction Machinery Inc., which became CMI, in 1964 to build machines that combined duel-lane subgrading, material spreading and fine grading. By the end of the decade, every state required, by contract specification, the use of such machines. Source: Are We There Yet? Building America's Transportation Infrastructure Network, written by John Yow. The book celebrates the 100th anniversary of the American Road & Transportation Builders Association.