The story of traffic lights

The first lights for railways had …
only one colour.
two colours.
three colours but they were different than now.
The wight lights didn't work well because ...
the conductors couldn’t see them from far away.
they sometimes broke.
it was easy to mistake them for other lights.
The colour red was chosen because …
it is easy to pick.
it makes people think.
it reminds people of danger.
The colour green was chosen because …
that’s the colour the brain likes the best.
of the strong emotions connected to it.
it makes people calm.
The colour yellow was chosen because …
it was brighter than the other two colours.
it is like sunshine.
it naturally makes people wait.
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