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.

Think you know EXACTLY when and where to curb your wheels? Take this week's parking quiz from David La Bua and find out!

You must curb your wheels when the grade of the street is at least what percent?
 
A) 0%
 
B) 3%
 
C) 20%
 
D) 25%
 
E) 50%

Photo via m hoek on Flickr.com