A road speed limit is the maximum speed allowed by law for road vehicles. Speed limits are commonly set and enforced by the legislative bodies of nations or provincial governments, such as countries within the world.In addition to setting a maximum speed limit, most governments also enforce speed limits which are relative to the driving conditions experienced; that is, drivers should adjust their maximum speed when driving in fog, heavy rain, or other similar conditions. For example, the California Civil Code 22350 states that "No person shall drive a vehicle upon a highway at a speed greater than is reasonable... and in no event at a speed which endangers the safety of persons or property." This "basic rule", or similar legal language, applies even where no maximum speed limit is in place (such as formerly in the U.S. state of Montana). Some roads also have "minimum speed limits",
