I've had this problem recently, and it may be relevant to some of the newer users around here, so:
What system of road naming is consistent?
I thought of this one system for Litvania in April, where primary roads are S[number], secondary D[number], and tertiary are just numbers.
But where do these start? How do i keep it consistent?
I ask for suggestions and maybe new proposals, everything is welcome. Unnamed roads are boring.