1 and 2 are fine.
In 3 and 4, it's redundant to have "police" in there.
1. There used to be a traffic cop on the corner.
2. There used to be a traffic officer on the corner.
3. There used to be a traffic police cop on the corner.
4. There used to be a traffic police officer on the corner.
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Can we use #3 and #4?
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