Has anyone else seen the new expressway shields Japan has been installing? They look like this and are posted as cutout shields:
https://imgur.com/a/QsX1Ncz
They're not quite as creative as what I proposed to the MLITT, but it's better than just putting the expressway numbers on a square sign.
https://imgur.com/epBaOBj
That's an improvement over the rectangular designs proposed in 2017; see Japan Expressways thread: https://www.aaroads.com/forum/index.php?topic=17186.msg2254346#msg2254346