why do countries such as South Korea and China have latin numbers and letters on their license plates when their language doesn’t use them?

Question

Edit: Latin letters and numbers might not be the right word. I meant letters such as AaBbCc and numbers such as 123.

In: 3829

Answer 1

For numbers, the same reason we use 1 and not one. 2468 is a lot easier to read than “two four six eight” or 二四六七, and they’re used the same in practice. Arabic numerals are universal globally.

For the letters, it’s just easier than trying to use Chinese characters. That one seems weird, but I guess pinyin is accepted enough that people know the characters and it makes sense.