I recently started a new career replacing street lights with Byers Industrial Services. We are changing all the HPS lights to LED for DEL DOT. This is where I spend most of my time in the morning. LOL.
Looks like a good source of signals too if you don't mind the newer 12" units. Personally I prefer the smaller 8" signals for collecting and display though.
I see an earlier M400A? I would love to have some of those. Would you be able to get lights from the work you are doing for me? I'd like to get a few early M400A.