This is a diagram of Chūgoku Expwy route sign. This image's glyphs are the outline path from free font that is "GD-HighwayGothicJA(pumpCurry)". If you want to change the glyphs, you MUST check the license of substitute glyphs/fonts.
道路標識、区画線及び道路標示に関する命令別表第2（国土交通省道路局）
フォント「GD-高速道路ゴシックJA（byぱんかれ）」の提供元
5r4ce2[Fiber Force2] pumpCurry's Website - font Junction at hogera.com
Broad-Sky in Japan

Font "GD-HighwayGothicJA" - pumpCurry in Japan