My recollection was that in Oregon, one can coast downhill in neutral in cars, or clutch in only in trucks,but...
Stack Exchange says
Quote:
[Oregon Revised Statutes, Chapter 811, Section 811.495]
Unlawful coasting on downgrade.
(1) A person commits the offense of unlawful coasting on a downgrade if the person is the driver of a vehicle on a downgrade and the person coasts with the gears or transmission of the motor vehicle in neutral or with the clutch disengaged.
(2) This section does not apply to the driver of a motorized bicycle.
(3) The offense described in this section, unlawful coasting on a downgrade, is a Class D traffic violation.
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skeptics.stackexchange.com/questions/14159/is-it-illegal-in-any-u-s-jurisdiction-to-be-in-neutral-at-a-red-light
Not a primary source, that would be the DMV, but the article lists a number of other States as well.
When I worked at a feed & seed company in high school. I knew a driver that could shift the International truck up and down through the gears without the clutch.