another way of saying it would be if the horse travels a set distance then gets to stop, consistently, then obviously the horse will want to cover that distance as quickly as possible, because it'd get too stop sooner.
happens a lot with racehorses who seem to just want to get faster all the time. truth is they really want to stop, they've just learned that going a long way away and getting there quickly will allow them to stop. also happens a lot in reining when a horse begins to anticipate the slide stop at the end of the arena, so the horse accelerates much too fast in the rundown because obviously the faster they get there the sooner they get to stop and be lazy.
not sure why people don't use thinking like that for lazy horses rather than just resorting too big(ger) spurs or whips.