I think i remember reading an interview with steve ritchie saying the pin is based off of a real life situation he got into. Maybe that was what he thought they looked like as he was beign chased?
From Wikipedia Steve Ritchie:
After that, he returned to pinball with 1986's High Speed, which was based on a true story about him being chased by the police in his Porsche. High Speed's bill of materials was higher than other games, and some rival Williams designers nicknamed it "High Cost".
From Steve Ritchie's website:
Wow, there they are! We called them "The Blue Cops From Hell!"