拖拉机行驶时必须做到十二慢拖拉机行驶速度的快慢，是影响行车安全的重要因素之一。从无数血的教训总结出结论，十次事故九次快。违反交通规则的快，不仅容易出事故，而且容易损坏机车。因此，在拖拉机行驶中，为确保人身和机车安全，作业完成快，行车时必须做到十二慢：... Tractor must be slow twelve tractors speed, is one of the important factors affecting traffic safety. From the lessons of innumerable blood concluded that the ten accidents nine times faster. Violating traffic rules quickly, not only prone to accidents, but also easy to damage the locomotive. Therefore, in the tractor driving, in order to ensure the safety of people and locomotives, work is completed fast, driving must be done twelve slow: ...