Quote:
here in the US, at least in AZ, a ticket does not count unless the individual receiving it acknowledges that they received it. is that so over there, too?


Nope. The charge is mailed to the vehicle's registered keeper, who must respond to say who the driver was at the time. If the keeper does not respond, they are held accountable. If the speeding offence wasn't too serious (and if you don't already have too many points on your license) you can choose to pay a fine and get three points. If you don't do so it goes to court, with or without you, and if found guilty you get a much bigger fine (and potentially more points).

The vehicle keeper is responsible for keeping their current address on file, so can't object on the basis of not receiving the charge because they moved. It has been known for people to claim that they did not receive the original charge, and only found out about it when summonsed to court - it is possible to get away with paying the (much lower) original fine if the magistrate is in a good mood.

Rob