British cars need to pass a yearly inspection (called the MOT) to be legally allowed on the road, and if you drive around with a failed or expired MOT then you WILL get caught and the punishment will hurt.
It's quick and easy to get the test done yearly and it's not a big deal; the system works well. You can even go online and look up the MOT history of any car, which is handy if you're about to buy the car as it'll let you know about any historical faults.
I assume there's something similar in most developed countries... why does America not do this?