Instead of some cars, chickens will run along the roads. Replace the rccam.dff and rccam.txd files in the gta3.img archive and the cargrp.dat file in the GTA San Andreasdata folder (be sure to save the original first). I didn’t manage to ride in such a chicken car, although people miraculously came out of the chicken. You can shoot a chicken, it will smoke and run. As a result, it will explode like a car.