A motorist driving from Paris, Illinois, to Moscow, Idaho, may encounter more diversity in traffic laws and road signs than a motorist driving from Paris, France, to Moscow, U.S.S.R. Unification of traffic legislation is but one example of the increasing unification of law within the communist-led states of Eastern Europe, among these states, and between them and the rest of the world.' Most of these states had been active in the international unification movement before the Second World War. While the coming of Communist power after the war meant a break with many traditional European legal patterns, participation in unification has continued. A majority of the people of Eastern Europe live in the two multinational federal states, the Soviet Union and Yugoslavia. The post-war years have seen sustained and successful efforts for internal unification of law in both these states, though much remains to be done, particularly in Yugoslavia. The new system of state monopoly of foreign trade has led to the creation of new institutions and a new unified foreign trade law in the communist-led states. In addition, these states have cooperated increasingly with Western Europe and the rest of the world in the unification of a number of important areas of the law. The unification process has involved the use of all the traditional forms of eliminating or reducing legal diversity plus a number of forms that contain significant new elements of at least creative adaptations of prior experience. The high degree of centralization inherent in the Soviet federal system has allowed internal and international unification on a scale and by methods that would be difficult for a looser federation such as the United States. The freedom of enterprise accorded the commercial sector of Yugoslavia's economy has allowed it to remain in the mainstream of European trade practices. Within the Council for Economic Mutual Assistance (CEMA), the administrative agencies of the member states have engaged in rulemaking on a multilateral basis, avoiding the delays and rigidity of the formal treaty process. Major differences in ideology and economic structure in the area of