prescribed amount such as 75 80 90 95 or any other suitable value or if the brake fluid pressure exceeds a prescribed value the apparatus is arranged to over ride automatic actuation of the brakes 132 134 in some embodiments brake pedal position may be determined responsive to the value of brake fluid pressure in some embodiments the apparatus 120 is responsive to brake fluid pressure in a master cylinder of the braking system in some embodiments the apparatus 120 is responsive to brake fluid pressure in one or more other portions of the braking system in addition to or instead of the master cylinder of the braking system in some embodiments the apparatus 120 may be operable to over ride automatic actuation of the brakes 132 134 in the event that the driver initiated rate of increase of brake fluid pressure in the master cylinder exceeds around 50 bar s u2212 1 in some arrangements the apparatus 120 may be operable to over ride automatic actuation of the brakes 132 134 if the driver initiated rate of increase of the pressure exceeds this value for a prescribed period of time such as a period of 100 ms other values of the rate of increase of fluid pressure are also useful other values of the prescribed period of time are also useful furthermore the apparatus 120 is arranged to over ride automatic actuation of the brakes 132 134 in the event that the accelerator pedal 121 p moves at a rate exceeding a prescribed rate or is depressed beyond a prescribed.