[doubletgl]

For the study with cars at an intersection, they simply used the model and make of the cars, so an old toyota vs. a new mercedes for example would be on opposite ends of the spectrum.

[badpun]

The problem with that is, plenty of wealthy people drive mundane or even frugal cars. I'm guessing that the need to drive a flashy car can correlate with being an asshole much more strongly than wealth.

[chrisseaton]

The Queen of the United Kingdom's state Bentleys were made back in 2002 so she's presumably working class in the eyes of this study.

[C1sc0cat]

The only time I have seen the Queen she was in a 1950's or earlier Rolls Royce.

I used to work near St Pauls so you occasionally had official events.

Also Prince Charles famously has a 40 year old Barbour he wears