Federal Motor Vehicle Safety Standards; Stability and Control of Medium and Heavy Vehicles During Braking

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This notice proposes to modify the implementation schedule for and certain requirements in the agency's September 1993 notice proposing to improve the stability and control of medium and heavy vehicles during braking. In response to the Intermodal Surface Transportation Efficiency Act (ISTEA) of 1991, the agency proposed in the September notice that medium and heavy vehicles be equipped with an antilock brake system (ABS) and be able to comply with a 30 mph braking-in-a-curve test on a low coefficient of friction surface using a full brake application. In this supplemental notice, NHTSA is proposing to amend the implementation schedule for the rule and to require independent wheel control on at least one axle. The agency's decision to issue this notice was prompted by comments on the NPRM favoring such changes.