And to be fair to TFL truck they weren't using the throttle as an on off switch. Thet accelerate at full throttle on the on ramp to the freeway until they reach the speed limit. That's pretty common towing so you aren't trying to merge with 65 mph traffic only going 30. Then when they reach the speed limit they just try and hold exactly that number, not on and off. They just let the transmission shift however the transmission is programmed to shift.
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