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Regulators never settled on a speed at which the limiters would be set. FMCSA and NHTSA had proposed and sought comment on a range of 60 to 68 mph.

Regulators are delaying until 2025 a supplemental heavy-duty truck speed limiter proposed rule, an automatic emergency braking final rule and a proposed new truck driver seizure standard.

Years of pleas from parents whose son was killed by a speeding tractor-trailer, buy-in from some truckers and the promise of fewer highway deaths convinced U.S. officials in September to propose requiring speed-limiting devices on all large rigs.