Cheapest Permanent, Anti-Off-Road Vehicle Barrier Option?

I understand that these concrete bollards I create, with the higher density concrete won't fully withstand a 50 mph car blasting through entirely, but it will give them a really bad time.

Mine will look similar to these at 36H" x 10"W, but will be bolted much sturdier into the 3 foot footing underneath. (https://www.theparkcatalog.com/35hx1...ncrete-bollard)

I may be able to go with a 2' footing instead due to the fact that the weakest point will most likely be the concrete above, rather than the footing itself.

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Cheapest Permanent, Anti-Off-Road Vehicle Barrier Option?