text: can a city with 3500 people have there police run radar on a highway?   without knowing what state you're in, it's not possible to answer your question.  this may vary by state based on that particular state's laws.  in california, the answer is yes...police may operate radar on a highway.  although, in california, a highway is defined as any road other than a freeway.  if you mean freeway, the answer is still the same.