Here is how to construct, on your computer a precise, 35 degree down grade, the complement to Angle B, below...which is, itself, 55 degrees..That 35 degree downslope is what DPW wants to be built on Parker Ave. Who would use it?

Mathinary on Android?

Download it for free at Android Market.

Construct a triangle with the angles A=90 B=55 C=35

Thanks to the website,  "Mathinary"...for this calculation and image.

So, from B to C is the downslope that DPW is saying has to be the 35 degree slope into the garage.

Picture doing that daily, or, more daunting, picture backing up, to come out to the street.