to put passenger on the roof

[Emir]

Hi everyone,

While reading a book I have encountered a sentence in which "to put passenger on the roof" phrase is included. Could anyone tell me the exact meaning of this?

the whole sentence is as following;

I told you not to put passengers on the roof

Many thanks

[Mister Micawber]

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In some countries, public vehicles (buses and trains) carry passengers on top of the bus or train car.
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Native English teacher at Mister Micawber's