WESTMINSTER, Colo. (AP) _ Someone apparently bent on taking the wind out of a police crackdown on speeders has been puncturing tires on patrol cars and motorcycles by sprinkling the officers' highway hideaways with roofing nails.

Since May, more than 40 tires on patrol cars and motorcycles have been flattened by the roofing nails, authorities said Wednesday.

After it happened more than once, Westminster police figured they were targets of booby-traps placed by someone who knew just where officers would park while looking for speeders.

''It was just too coincidental,'' said police spokesman Rick Kempsell.

The latest incident occurred Wednesday on a ramp leading to westbound U.S. 36. Two tires on a police car were punctured. Police estimated 300 to 500 of the small nails were scattered along the ramp's shoulder, less than a quarter mile from police headquarters.

Roofing nails also have been found scattered near emergency vehicle turnaround areas along the turnpike and Interstate 25.

The three-quarter-inch mails have flattened at least 30 patrol car tires and ruined at least a dozen police motorcycle tires since May. Car tires can be repaired, but the motorcycle tires must be replaced at a cost of $127 apiece.

Police said there's no way to know how many passing motorists also have had tires flattened by the nails.