> being in the middle of a public roadway in a registered vehicle shouldn't confer the expectation of privacy

And this is where US caselaw and my personal beliefs about privacy start to differ. Why can't we expect some level of privacy in a public place? There are some countries that confer that, to certain levels.

> Why can't we expect some level of privacy in a public place? There are some countries that confer that, to certain levels.

The US used to be one of those countries, then 9/11 happened and the loudest folks (or at least the folks with the most money to influence law) started eroding privacy and now more folks just accept our current state and views like OP’s.

It’s really interesting…you can even watch a TV crime drama series, like Law & Order, and see the privacy erosion in the TV show. That transition is basically a reflection of what happened in the US.

“Why can't we expect some level of privacy in a public place?”

Because it’s a public place. We already have laws covering things like harassment, voyeurism, etc; so existing legal conduct in a public place should remain legal.