I recall a road trip with my father (this is at least 30 years ago), where we went to see my grandfather a few states away. As we drove through some small rural town, we were tailed by the local police for quite some time until we hit the county line and they simply turned around -- my dad told me at the time that they must have been following us to see if they could find a reason to pull us over. As I grew up, and started driving myself, I believe that to have been the case. Quotas for tickets and arrests are definitely a problem in the US.