You have a great opportunity for a nifty test, using those 3 signs.
Deer Crossing, Barber Pole and Leanington 12 mile sign all fit within the aiming ring, or at least I think that's the aiming ring.
With a nice fluid head on on the tripod you should be able to move between the three sign and get a feel for beam/detection sensitivity.
Sound pretty nerdy but I do this kind of stuff all the time.
Another is, if you can get that black cow to reposition itself in that same spot, you should be able to measure the cow, under the cow, over the cow and on the ditch bank getting separate readings.
Or you could if you thought about it do something much more fun, seeing as how it's Friday evening.....