The maximum deceleration that can be developed in dry weather by a vehicle with tires and brakes in good condition is about 25 ft/sec. (Acceleration and deceleration are sometimes specified in miles per hour per second, or kilometers per hour per second. Multiply mphps by 1.467 to obtain ft/sec and multiply kphps by 0.278 to obtain m/s2. However decelerations of 14 ft/sec are experienced by occupants as uncomfortable and alarming. 11 ft/sec is the appropriate upper limit of desirable decelerations, and approximately 9ft/sec is the maximum comfortable deceleration from high-speed travel.
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