Method for setting speed limit sign position of expressway special for passenger cars

The invention relates to the field of intelligent public transportation, and discloses a method for setting the position of a speed limit sign of a special expressway for a passenger car, which comprises the following steps of: 1, acquiring relevant parameters of roads and traffic of the special expressway for the passenger car; 2, carrying out a real vehicle experiment to obtain vision and reaction characteristic parameters of a driver in an ultra-high-speed state; 3, calculating a discovery distance d1, a judgment distance d2, a decision distance d3, a reaction operation distance d4, a visual recognition deceleration distance L1 and a maximum tolerance distance L2 according to the obtained parameters; 4, according to the visual recognition deceleration distance L1 and the maximum tolerance distance L2, the speed limit sign preposition distance selectable range gamma is determined; 5, simulation software is used for conducting a simulation experiment on the preposition distances of the different speed limit