Railroad & Special第 25 / 80 题
At a railroad crossing, a school bus must:
a.Slow down but may roll through if no train is visible
b.Stop, whether or not it is carrying passengers, unless the crossing is exempt
c.Stop only when carrying students
d.Never stop, to avoid stalling on the tracks
解析
School buses are required to stop at railroad crossings whether or not students are aboard, except at crossings marked exempt or where a police officer or signal directs otherwise. The driver stops, looks, and listens before proceeding. This rule exists because of the catastrophic consequences of a train collision.
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