It was a Ford van that was used for the testing. NASA was involved with the aerodynamic studies. It started out with a box form & was modified along the way during testing, by rounding corners & then adding a boat tail & so on, as the testing progressed. Edwin J. Saltzman began the testing in 1973. A cab over engine(COE) tractor trailer was also used for testing aerodynamic effects, for large roadgoing vehicles.
