Shanghai recently occurred repeatedly stirring traffic accident vehicle and earthmoving vehicles, several people died. In USA, very few large car traffic accident. Why?
    
    First of all, a driver's license is not easy. In America, cement mixer, earth moving vehicles, including buses, will be in the commercial vehicle driving license (CDL). The law, at least 21 years old to interstate transport. In American, usually money employers choose experienced drivers to take CDL.
    
    CDL is very difficult to test. In California, a written test and road test is available in many languages the driver's license test, but CDL can only use English test. The special terms and the various uses and mode of operation, have quite one part person turned out. A driver only three times a year test opportunity, each for 45 minutes to 60 minutes; while the average driver's test is generally 20 to 25 minutes. CDL test to all situations, including high speed, railway, bridge and so on.
    
    Secondly, a CDL drive with great care, too. California Law: general road, the truck can only travel in the right most lane; if it is a multi lane highway, driving in the right two lanes; such as long time driving on the high way, must be on the right second lanes; top speed on the freeway design of high speed slower than the 10 miles (16 kilometers).
    
    Third, the truck size, far inferior to other vehicle flexible, so also need to understand with other vehicles, so the other driver must also understand the large trucks, such as truck driver's blind spot in what place, how to go beyond the truck, and the truck at what distance, in the traffic rules in clearly written.
    
    As for the driver's income, according to the "Friends of the earth car drivers" web site information: America earthwork car drivers in general income of $29000 to $42000, while the American average annual family income of nearly $50000. That is to say, a moving car driver can support one family. The car driver salary difference lies in: the driver experience in itself, the size of the company and the employer's price. The three and the driver is driving related experience, rather than the number of cargo.
    
    In USA, not easy to open the truck: a truck accident cost, absolutely can not depend on the amount of running back. But once opened, will definitely become stable occupation.