The web and app company Bike Citizens has trawled its database of cycle infrastructure to create these ‘naked’ cycle maps. Blue lines = protected bike lanes; grey lines = painted lanes. Can you identify the cities?

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A note on the maps …

Bike Citizens say: Blue lines show “a separate way for the use of cyclists”. They include routes tagged as highway=cycleway (a separate way for the use of cyclists), cycleway=track (separated from the road by curbs, parking lots, grass verges, trees or another physical barrier, but is running parallel and next to the road) or bicycle=designated (often bike lanes in parks or along rivers).

Grey lines include routes tagged cycleway=lane. This is used for streets where there are cycle lanes on both sides of the road, or one-way streets where there is a lane operating in the direction of main traffic flow. Bike lanes which are painted on the road – but not physically separated from motor traffic – should come under this classification.

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