A traffic policeman asked him to move his car.

一位交警让他挪动一下他的车。

《柯林斯英汉双解大词典》

There is a traffic policeman over there. You can ask him the way to the station.

那边有一位交通警。你可以向他打听去车站的路怎么走。

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One helicopter can cover the work of 30 police cars and 100 policemen, a traffic policeman told the newspaper.

一位警官告诉记者说，一架直升机可以替代30辆警车和100名警察的工作量。

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At a traffic circle near a dam on Samarra's outskirts, an Iraqi policeman approached the Marines and asked if they had come for prisoners, Fisher said.

CNN: Marines rescue seven U.S. prisoners of war

It was a policeman, not the one from the village but one of the provincial traffic police.

NEWYORKER: Free Radicals