The conferences issued a model Uniform Vehicle Code for adoption by the states and a Model Municipal Traffic Ordinance for adoption by cities. Both were widely influential, promoting greater uniformity between jurisdictions and tending to promote the automobile's priority in city streets.[115]

Hoover's image building
Phillips Payson O'Brien argues that Hoover had a Britain problem. He had spent so many years living in Britain and Australia, as an employee of British companies, there was a risk that he would be labeled a British tool. There were three solutions, all of which he tried in close collaboration with the media, which greatly admired him.[116] First came the image of the dispassionate scientist, emotionally uninvolved but always committed to finding and implementing the best possible solution. The second solution was to gain the reputation of a humanitarian, deeply concerned with the world's troubles, such as famine in Belgium, as well as specific American problems which he had solved as food commissioner during the world war. The third solution to was to fall back on that old tactic of twisting the British tail. He employed that solution in 1925–1926 in the worldwide rubber crisis. 