I recently found myself at a building with these signs:
I was curious to see what cameras they were using, so I began looking. While I did look closely/carefully for cameras, it was rather easy to tell they do not have any cameras as the foundation/siding/trim/gutters/fixtures are all sprayed green. I circled the building twice and discovered that the extent of their security is outdoor lighting and five of these signs.
Have you been on a site survey / job site and seen anything like this? Share in the comments below.