I can't think of anything more symbolic of modern America than the ubiqitous checkpoint. In our town, every Friday night there are several by the city, county, and state police. It's been this way for decades now.
They run them for two reasons, ostensibly. The obvious alcohol and now seat belts laws. Of course, the real reason is to get everyone used to the idea of restricted travel. At least we don't have to take our shoes off at the checkpoints - yet!!
Like many important aspects of our society today, it flies in the face of the original spirit of America.