A double-decker bus - a bus with two levels.
a roundabout- trafiic goes round it in a circle.
traffic-all the cars, busesetc. in a street.
traffic lights - coloured lights in a street; they stop and start the traffic.
a zebra crossing - black and white line on a street; people can cross cross the street there.
an open top bus - a bus without a roof.
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