forty two CFR §- Simple Zero. 121; Air braking system assistance
S3. Which practical relates to trucks, busses, and trailers equipped with heavens brake assistance. But not, it will not apply at:
Software
(a) People truck who has a distance in excess of ins with data format equipment from the fully retracted standing which is armed with a couple of small song axles within the a line across the thickness out-of the newest truck.
(b) People automobile armed with an axle that a terrible axle lbs score (GAWR) from 29,100 pounds or higher;
(d) One truck who may have an increase attainable in 2 kilometers off only forty-five mph, a keen unloaded automobile lbs that isn’t less than 95 per cent of the terrible auto pounds get (GVWR), with no capability to bring occupants except that the newest driver and working crew;
(e) People trailer that an effective GVWR of more than 120,one hundred thousand lbs and you may whose body conforms to this explained on concept of hefty hauler trailer established during the S4;