Abstract: A piston-type variable-speed control device. The piston-type variable-speed control device comprises a plurality of piston-type speed bump structure apparatuses installed on a road surface, a vehicle speed detection device, a speed controller and an electrical power supply. Each of the piston-type speed bump structure apparatuses comprises a ridge platform. A height by which the ridge platform is raised, a time to raise the ridge platform, and a duration for which the ridge platform is raised are controllable to cause a jolting motion to one or more front wheels, one or more rear wheels, or a single wheel of a speeding vehicle. When the speed of a passing vehicle exceeds a predetermined speed limit, the piston-type speed bump structure apparatuses stay at moderately raised position to cause an obvious yet safe jolting motion to the passing vehicle.

Abstract: A piston-type variable-speed control device is described. The piston-type variable-speed control device comprises piston-type speed bump structure apparatuses which are installed on a traffic lane of road, vehicle speed detection device, a speed controller, a display screen and an electrical power supply, wherein the piston-type speed bump structure apparatuses and the vehicle speed detection device are respectively connected with the speed controller, and the speed controller is further connected with the display screen and the electrical power supply. When the speed of a passing vehicle exceeds the speed limit, the piston-type speed bump structure apparatuses stay at moderately raised position to cause obvious and safe jolting motion to the vehicle. With the striking raised visual design and jolting motion on a driver, the present speed control device controls vehicle speed by means of control of the driver's behaviors.