I think we should stay on the DARK BLACK lines on the map

We haven't figured out yet, even after all these years, which is better, to have Mary navigate and Jim drive, or visa-versa. Anyway, one day last week we were driving to Anne & Nate's, and Jim made the very wise comment. "I think we should stay on the dark black lines on the map for awhile". This was as I was taking what I thought was the quick way across town. Then last Sunday, coming home from trying out an "interesting" church (more on that later), we came across the above sign.
Driving here is a challenge, although I do appreciate the fact that almost EVERY street has a number instead of a name. Brier seems to be the only town around here that has real street names. Bothell is splitting the difference by posting BOTH the numerical name (ie 225th St SW) and the original name (Jackson Way or whatever) But then, the numbers don't really help a lot when 196th turns suddenly into 44th or something.

Another thought about the northwest, or any metropolitan area on the west coast, why is it that liberals have to plaster bumper stickers all over their cars? Are they trying to protect the paint from the sun, and thus no more hydrocarbons will escape, and they will save the planet?