 The Middle Loop plan, including its passage northwest through the center of Ivy City, was first proposed in 1946 in a study of the D.C. highway system conducted by the J. E. Greiner Company for the city government.Subsequent studies by the Federal Highway Administration (FHA) (1959), Clarkson Engineering Co. (1961), National Capital Planning Commission (NCPC) (1961), National Capital Transportation Agency (NCTA) (1962), J .E.Greiner Co. (1964), NCPC (1965), and J. E. Greiner Co. (1966) appeared between 1959 and 1966.