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Those who want fewer and less punitive ways of restricting speed on the roads like to argue that the relationship between speed and the number of accidents is unproven. Even if it were showed by trial that a more relaxed regulation of speed did not increase the global accident rate, the finding would still not be acceptable per se, since the increased speed would itself have deterred other modes (children being allowed to walk to school rather than being driven, cyclists using rural roads) and therefore skewed the result. A controlled experiment isolating wider factors is a virtual impossibility.