In Ohio, they still have those kind of processions for cemetary burials. In my younger days, the name, famous or not, didn't matter. You showed a funeral procession respect because it carried the remains of a human being with enough people who cared about them in life to need a procession. It was just the decent thing to do.
Police escorts were usually hired for large processions, or those needing to take a freeway, so traffic could be managed as needed. Someone well known in the community could have a procession that lasted several turnings of the traffic lights.
The Rich keep getting richer because they keep doing what it was that made them rich. Ditto the Poor.