Generally in the cab of the vehicle the operating temperature is considerably better than the ‘under the hood’ environment but it still can range from -45°C to as high as 60°C. The braking operations not only activate the brake shoes through a hydraulics system, but the sensor sensing the brake pedal movement must turn on the brake lights and disengage the cruise control. In heavy traffic, sudden stops can be the norm. Advanced warning through use of the brake lights can give the operators behind just enough time for them to brake and avoid a rear end collision. Similarly, if a driver’s vehicle were in cruise control and the need to brake arose, it’s vital that the cruise control is disengaged; otherwise fuel would be continually dispensed trying to speed up the vehicle.