Way back in the 1950's a neighbor cast his fence posts out of concrete and rebar, mainly to save money. The posts were deeply set, so after he passed and the land was divided and sold, the new owner wound up leaving them in place when he planted his hedge. Fast forward thirty some years when a speeding drunk who was fleeing from police decided to attempt to drive through said hedge and happened to locate one of those posts with his F-350.. The sixty year old post did get pushed over, but not before doing considerable damage to the truck. It got me thinking that this would be a great way to keep barrier protection flying under the radar if that's part of your defensive strategy, especially in the suburbs. Obviously you would want something more substantial and placed closer together than the 10 feet spacing my departed friend used.