The advertising industry more than makes up for the lack of governmental shame in the US. Also I don't think the LGBT or most monitory communities would agree that shame is underused.

I'd love to see the HOV idea though.

As someone else wrote in a different thread: “The shamee must consider themselves subject to the same social norms as the shamer."

So the HOV thing would only work on people who thought it was morally or socially wrong to drive in the HOV lane. If you, for example, believe that HOV lanes are simply a handout to already-rich Tesla drivers and just remove a useful lane from the rest of us, then the only reason you don’t drive in them is the risk of a fine if you get caught. These people don’t care if they are publicly called out for breaking a rule because they reject the moral basis of the rule.