No U-turns! Mystery Cache

I've done so many u-turns that I started counting them and even named myself a "World Authority on U-turns", like there was such a thing!

At my 2,000th cache find workerofwood presented me with my own set of "No U-turns" signature tokens made of polymer clay. I started numbering them and placing them in caches. Marky has even set up a tracking site for them. I figured it would also be cool to create a puzzle based on them, so here it is. All you have to do is figure out where my tokens originate from. The cache is a magnetic micro in an appropriate place.