This CLEO script increases amount of vehicles/peds in San Andreas and their draw distances.
It's a bit improved version of a snippet, published on sannybuilder forums a while ago.
Installation: copy "SA_Traffic.cs" to GTA SA 'CLEO' directory.
commented a month ago:
I would also like to know how this differs to that mod by Toby, and what would happen if I use both mods simultaneously on the same game.