Mixed Rate of Large Vehicles in Expressway Variable Speed Limit

Speed limit is an important strategy to avoid speeding.The main parts,operation principles,and application of the variable speed limit system were discussed.The Jingjintang Highway was selected as an example to analyze the time distribution of large vehicles.Their impacts on traffic flow and speed deviation were analyzed.The procedure for setting dynamic speed limit based on large vehicles scale was introduced as well as the speed limit.The relationship between large vehicles scale and the speed was decided,and the speed limit was calculated.The precise real-time information of the variable speed limit can be helpful to the drivers.