While most European countries issue driver's licenses at age 18, the difficulty of passing the test, high insurance costs and wide use of trains and buses all mean that young people generally begin to drive much later than in the United States.
"They start drinking at 16, but they cannot drive until they are 18," said Florence Berteletti Kemp, a communications officer in Brussels, Belgium, for Eurocare, a private group that campaigns to reduce Europeans' alcohol consumption. "I think in the U.S., there is an expectation to have your own car. It's not that young people in Europe are more careful. It's that they haven't got the car."