[brewdad]

When I visited Copenhagen a few years ago, most of the bikes I saw were either unlocked or locked to themselves to prevent riding off but not carrying away. It was rather shocking.

[bluGill]

You see that on any area where there is low crime.

[sudosysgen]

Hmm, no. Bike theft is extremely common in Japan, for example. There are very few places in the world where you can do that, no matter the crime leve.