Vehicle speed control system and method of ramp merge area

The invention discloses a vehicle speed control system and method of a ramp merge area, and belongs to the field of road traffic control. The system comprises a vehicle-mounted communication device and a roadside control unit; the vehicle-mounted communication device collects vehicle motion information and sends the vehicle motion information to the roadside unit; the road side unit receives information of all vehicles within a control area, makes decision in a concentrated way, manages and controls time when vehicles reaching a merge point in a unified way by utilizing a vehicle time regulation method within the area, forms vehicle behavior control rates in the area according to a time control requirement by utilizing a vehicle behavior optimized control method, and sends the control rateto each vehicle so that the vehicle can arrive at the merge point on time according to the received control rate. A vehicle and road concentrated communication technology is used, vehicle merge timeis controlled and vehicle