The other day I heard of one of these new peewee autos speeding fifty miles an hour on one of our main highways.
Why does the writer use "speed fifty miles an hour" instead of "speed at fifty miles an hour"?
trans. def 1. a.
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AHD "speed" v.trans. def 1. a. " To go, move, or proceed quickly: sped to the rescue."
Think of this use of "speed" as if it were "go". The writer made a poor choice, because when you are talking about a car on a highway, the reader will unavoidably think of exceeding the speed limit (unless that's what he meant, in which case he dropped the ball completely).