Who built that?

My uncle worked for a Mack dealer. His mailbox post was a crankshaft which he placed in a five gallon bucket (standing upright), and filled with cement. That was bolted to a big cement block buried underground. The mailbox itself was 1/4" plate steel. NOBODY messed with it....

 

Set up a hidden camera and watch the hilarity ensue.
For good measure I would write on the mailbox:
“Built Like A Mack Truck!!”

 

Just for the record, if you put up a mailbox made of substantial enough material as described in the posts above, and someone hits it and gets injured in the process, you are the one that is liable. Where I lived in Lehigh County PA, someone put up the mailbox as pictured with the concrete reinforcement. Someone hit it, it came through the windshield, and killed the driver. The owner of the property was prosecuted.
Same goes for any of the crankshafts, heavy pipe etc. All of it is on your property, but on the right of way. Why do you think all signage(stop signs, speed limits etc ) is all required to be on a breakaway base?

 

Yes, it is done. Yes it is pretty. Yes, most of them are in residential neighborhoods where speeds are low chances of hitting it and causing bodily damage are low.
Here is the official NY state DOT advisory on the topic, with several examples and the probability for injury. Since this information is available to the plaintiff's lawyer, as well as the homeowner, chances are very good if there were legal action, the plaintiff would prevail. In other words, you fortify your mailbox at your peril.

Mailboxes

And, here is the official 44 page US DOT manual on how to properly erect a mailbox on a highway. And you thought only truck drivers were regulated to death....

https://rosap.ntl.bts.gov/view/dot/13001

 

Driver paralyzed after plowing into an Ohio man’s fortified mailbox sues homeowner
It was only a matter of time.

 

If said structure is on your property and not in ROW, your good to go.

 

My two cents: you live in Ohio and you know dang well it snows and roads become icy at times. So run studded tires or chain up. Good grief.

As for intentionally striking mailboxes and becoming injured in the process, you got what you deserved.

These so-called laws only help lawyers.