Abstract: The device with electrical or pneumatic actuation of a folding mechanism for encouragement of reduction of vehicle speed consists of bars with accelerometers that function as step-on sensors, which transmit information to a controller that immediately determines the speed of the movement of a vehicle, after which it sends an order to an actuator with electric motor or a pneumatic actuator with an aim of raising the folding speed reduction mechanism in the case when the vehicle moves at a speed that is higher than the one programmed into the controller and after a certain period of time to return the device to its standby position, or to leave it in the standby position, i.e. not to raise the folding speed reduction mechanism. if the vehicle is moving at a speed that is lower than the one programmed in the controller.