Revolutionary France , however , overturned this practice as part of its sweeping social rethink . A change was carried out all over continental Europe by Napoleon . It changed under Napoleon because he was left-handed . His armies had to march on the right so he could keep his sword arm between him and any opponent. From then on , any part of colonized by the French travelled on the right .

　　After the American Revolutionary War (1775—1783) , the US became independent and decided to make traffic drive on the right in order to cast off all remaining links with its British colonial past . As America became the center of the car industry , if you wanted a good reliable vehicle , you bought American right-hand-drive cars . From then on , many countries changed out of necessity .

　　Today , the EU would like Britain to fall into line with the rest of Europe , but this is no longer possible . It would cost billions of pounds to change everything round . The last European country to change driving on the right was Sweden in 1967 . While everyone was getting used to the new system , they paid more attention and took more care , resulting in a reduction of the number of road accidents .

　　32. Why did people travel on the left before the late 18th century ?

　　A. They were required to do so .

　　B. They were mostly left-handed .

　　C. It was easier to cross the street .

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