We should obey the traffic rules

Li Lei and his classmates wanted to go to Mount Yuan for the spring field trip .Because spring is the best time to climb mountains. The weather is very fine .It’s not too cold and not too hot .Li Lei and his classmates decided to go there by bike. But on the way, Li Lei made a wrong turn, and a traffic accident happened. Li Lei’s right leg was hurt. (His classmates had to send him to the hospital.)So it’s very important for us to obey the traffic rules. First, when the lights turn red, we must stop. When the lights turn green, we can cross the road. Second, we shouldn’t ride too fast and we should ride on the right of the road. Third, we should always be careful and wear bicycle helmets when we ride bikes. Fourth, if we break the traffic rules, we’ll get a fine.

题目分析：根据题目要求可知本文主要以第一人称书写。在介绍春游及发生交通事故时要用一般过去时，但介绍交通规则时要用一般现在时，并使用情态动词should。可以适当使用序数词使得行文条理。

【亮点说明】本文作者使用序数词逐条介绍交通规则，非常条理。