Your road plates are absolutely amazing! I have been lurking on this thread for awhile and was hoping to see some more of your awesome work.
I read that you printed these from your office, and since 400 gsm is a relatively uncommonly thick card stock to print from a color laser printer, could you please disclose what brand and model your work printer is? Is it something like an Intec CP2020? I would love to be able to design and print something similar to what you have created, but I am wondering just how feasible that would be. Also, along those lines, is this printer a normal CKYM laser printer...as the white lines look almost as if they have been printed as well...which would of course require a completely different kind of laser printer.