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　　Many students get a driver's permit at 15．In California, they are then allowed to drive for 50 hours under supervision．"Under supervision" means that a friend or relative who already has a license has to ride with them．But what happens when teenagers(persons between 13 and 19 years old)start driving on their own?Many are careful drivers and never have a problem．But many other are not, and they create(造成)Problems on the road．Fifteen-year-olds are too young to drive, and sixteen-year-olds are too immature(不成熟的)to start driving alone．

　　In the United States, more teenagers are killed in driving accidents than in any other way．While fewer than 7％ of drivers are teenagers, teenagers are involved(占，包括)in 14％ of the terrible car accidents in the country．Sixteen-year-olds involved in over 43 crashes in every million kilometers they drive．But seventeen-year-olds cause only about 30 accidents a million kilometers of driving．One year makes a difference．So the age limit(限制)should be increased．

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