To understand a transport system, we need to build a city ...
Everyone has different ideas about what the city should look like and how it should run.
Where should new roads go?
Do we allow old cars on our streets?
Where do we put the airport?
What's the best place for my house?
It's important to cooperate but it's also important to use the best ideas.
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One group lays the groundwork.
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Another group works on the roads.
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This group is building.
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The city gets a train.
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With everyone working together ...
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... the city slowly takes shape.
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Road safety is important.
Cross at the crossing!
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This is the city's community centre. A birthday party is being celebrated here.
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Cities make lots of garbage. This machine gets rid of the garbage.
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We noticed there were too many signs on the road. That can be confusing and ugly!
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A helicopter waits beside a railway track for its next flight.
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There's a house in the middle of the park. Would that be a good place to live?
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