In a study by GMAC Insurance, one in ten drivers would fail a state drivers test. The GMAC Insurance National Drivers Test uses a sample of 5000 drivers nationwide between the ages of 16 and 65. Respondents take a 20 question written test similar to a state drivers test. There are a few highlights to the results. Apparently, the Northwest and Great Lakes States possess the most knowledgeable drivers and the Northeast and Mid-Atlantic States are the least. The report illustrates a few deficiencies in American driving habits and perhaps problems in driver's education. In America, driver's education is not as involved as in other countries. In fact, a lot of other nations impose a minimum driving age of 18, such as Germany and Japan.