These sensors are used to measure vehicle acceleration, i.e. acceleration, braking and cornering force, which are also used for drawing track maps. 3G (+/–) sensors have a measuring range adequate for normal vehicle behaviour. Peak values in accidents require larger ranges. The signals from a G-Force sensor are normally filtered to reduce high frequency noise on the readings, resulting in more accurate vehicle G-Forces. That way we are measuring actual forces on the vehicle and not vibration or engine noise.