Maybe my worst mistake as a do-it-yourself driving instructor was buying a "Student Driver" sign that sits on top of the car like a yellow hat.

也许作为一个自学驾驶的教官，我最大的错误就是买了一个“学车”的标志贴在车顶上。那看上去就象一个黄帽子。

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Thus, if the student driver runs into difficulties, the instructor can take over. This kind of car also has another special feature.

这种车还有一个特殊的地方，在轿车的顶部有一个标示：练习车。

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He worked as a driver, an inspector and an instructor.

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Mulligan's driving instructor, Jerry Thielemann of Freedom and Mobility Driver Training and Evaluation in Marietta, Georgia, experienced that firsthand.

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