南非采购需求：产品、交通标志

I'm interested in gathering detailed information about traffic signs that are used in the isizulu-speaking regions. Specifically, I'd like to know about the types of signs available, their functions, and any regulations or standards that govern their usage. Additionally, it would be helpful to understand the materials they are made from, as well as their visibility features and how they comply with local safety guidelines. Any insights on design options or customization would also be appreciated. Looking forward to your informative reply!