Which city's metro has such a logo?
Istanbul
Copenhagen
Madrid
Rome
The Copenhagen Metro is a 20.4-kilometre (12.7 mi) system opened between 2002 and 2007, and has two lines, M1 and M2.  The metro has 22 stations, of which nine are underground. In 2016, the metro carried 61 million passengers.
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Answers by country
Istanbul
Copenhagen
Madrid
Rome
answers
Denmark10
Germany38
Australia19
Republic of Ireland14
the United States75
the United Kingdom47
Poland2573
India36