AA, in this instance, stands for Automobile Association. The Automobile Association of South Africa offers a whole range of products and services to motorists - things like roadside assistance, pre-trip inspections, pre-purchase inspections and driver training. Their website has loads of useful info on all things motoring (but I suggest you take care if you're prone to migraines - there are an awful lot of flashing, moving graphics on the site too, which nearly drove me crazy).