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 La Bua, to dish out weekly tips on navigating the ins and outs of city parking.

For those of you who work downtown and commute by car, listen up: there are more parking spots out there than you know about. We'll post about where they are and how to spot them in a few hours, but for now, test your parking IQ with this quiz (we'll post the answer to the quiz in a bit as well).

What percentage of moving traffic in the SF business districts are drivers searching for curbside parking?

A) 5%

B) 15%

C) 30%

D) 75%

E) 100%

Photo via oscillize on Flickr.com