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ASR - Acceleration Slip Regulation

ASR prevents the driving wheels from spinning unnecessary while on slippery surfaces, or when the power coming from the engine is too much for ensuring good traction (unnecessary wheel spin). It also improves directional control with better traction during high speed cornering. Developed by Mercedes-Benz in the 1980's, the system uses the ABS speed sensors to calculate if one of the driving wheels is spinning faster than the other and automatically actuates its individual brake sufficient enough for it to regain grip (or arrive at the same speed as the other driving wheel).