So on my drive home from work everyday, I go through a large highway construction zone. Recently, the workers have put up a large LED sign warning traffic of upcoming tight turns and that they should slow down. This is one of your typical LED boards that you see all of the time during road construction.
However, the signs have K band radar emitting from them and I noticed that they were doing this even when the signs are off. I don't think the signs are monitoring traffic speeds but the radar may be part of a security system so no one steals the signs. I also get a strong Ka band radar signal coming from the site but I have been unable to pinpoint a source. I think this may be another security system for another piece of equipment.
What do you guys think? Has anyone had a similar experience?