"Big Brother" Strikes Again

I don’t know if it really works or not but, we have a fleet customer whose shop is on known speed camera trap. He got tired of his guys getting tickets, so he put computer monitor privacy screens on the plates of his trucks. He did modify them. He says that he hasn’t had any tickets since. I’ve seen them. You have to be right in front of the plate to see clearly. They’re black if look at them from other angles. Not sure what the legal word is. Probably not in his favor.