1. Process to reduce the change-direction-shock in a vehicle equipped with releasable brakes having a brakes-set condition to arrest movement of the vehicle in forward and rearward directions of actual movement, and further equipped with selectively operable torque transmission means having a selector to change the vehicle to a forward or rearward direction of movement desired and having a transmission-disconnect condition preceding each direction change, and signal comparison means (C,D) having only first and second points for receiving and comparing signals, said process comprising: producing a vehicle direction signal comprising a forward vehicle signal when the vehicle is moving forwardly, or a rearward vehicle signal when the vehicle is moving rearwardly, and producing a vehicle control signal comprising a forward control signal when the transmission selector is in forward or a rearward control signal when the transmission selector is in reverse, simultaneously applying one of said direction signals and an opposite one of said control signals to one of said points to disconnect the transmission and apply the brakes when the vehicle is moving in a direction opposite to the selected transmission drive direction, and simultaneously applying one of said direction signals to one of said points and a corresponding one of said control signals to the other of said points to engage the transmission and release the brakes when the vehicle just about stops preparatory moving in the same direction as the selected transmission direction.