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Current Practice <br />• Has remained relatively constant in approach over last two decades <br />• Four general methods: <br />1) Engineering Approach <br />2) Expert System Approach (USLIMITS2) (developed in 2007) <br />3) Optimization: setting speed limits to minimize the total societal costs <br />of transport <br />4) Injury minimization and Safe system approach: speed limits are set <br />according to the crash types that are likely to occur <br />