This modification enhances the advertisements on some of the vehicles in San Andreas, namely the Rumpo, Mule, Benson and Yankee. All of said advertisements are from past Grand Theft Auto games, so that it doesn't break immersion.
Advertisements include (as of 1.01):
True Grime: Street Cleaners
Last Drop Warehouse Services
Pay 'n' Spray
The Craw Bar
Bitch'n' Dog Food
Installation: Consult the README file included with this modification.