How do European policies affect national policy-making patterns and problem-solving capacity, and to what extent do national policy-makers seek to influence European politics? In particular, what impact does European road haulage policy have on national policy within the context of the Single Market Programme (SMP)? How can the domestic policy response of four member states - Britain, the Netherlands, Germany and Italy - be explained with respect to the national policy background, problem-solving approach, policy instruments, and patterns of interest intermediation? While the policy responses of Britain and the Netherlands reveal congruence and confirmation, those of Germany and Italy indicate respectively change and resistance