This isn't about a girl. Read the summary: "...streets known to have a prostitution problem." Legal/illegal aside, the premise is that the street has already been determined to have a problem, present perfect tense. Imagine your local street had a pot hole problem, whom you would call and what measures you would expect them to take. If your local government doesn't have authority over streets' behavior, then pray tell: who does?
Now, thanks to advances in police forensics, we have learned that some people drive on these streets, and in some cases we can identify these drivers or at least their associates. You've got a street coping with a problem, but insensitive commons-tramplers are using (relatively) heavy equipment upon it. What to do? I say there's no need to barbarously escalate. Just write 'em a letter, nicely asking them to transition toward a more tarmac-friendly lifestyle. My fellow Americans, we need more street-walkers and I think the leaders in visionary places like Los Angeles are just the policy-makers to help make that so.