It's no secret that parking in the city is a bitch. So we've enlisted local parking guru and author of Finding the Sweet Spot, David LaBua, to dish out weekly tips on navigating the ins and outs of city parking.

Doesn't it seem like DPT officers are absolutely everywhere, all the time? How do they do it? Take this quiz and check back after lunch for the brutal truth to be revealed.

How many parking officers are there per square mile in SF?
A) 6

B) 16

C) 106

D) 1600

E) 16000

Write your answer in the comments below!