I lived in South Africa for a couple of years where car jacking and vehicle theft were a huge problem. Many people installed GPS trackers on their cars, but thieves got hip to that and figured out how to quickly short it out to render it useless. Most people turned to low tech solutions like never stopping at red lights if there wasn't traffic in the other directions, having high fences with couple of Boerboels to guard the property, and parking only in lots with Security Guards and tipping them to make sure the car was there when you got back.
Read an article at least 10 years ago about SA carjackings and people installing side-mounted flame shooters. Was that really a thing?
Been carjacked. Followed my banker grandma’s rules for getting robbed. Still here.