I just got one "mark everything that shows bikes" with pictures of cyclists, motorbikes and cars. The translation used the norwegian word "sykler" which to me is the human powered one. But it looked like it wanted me to also select motorized ones as well. That's something that's lost in the translation.

Testing some more here https://www.google.com/recaptcha/api2/demo I also got "mark all fire hydrants". I've never seen one in real life, only those red in American cartoons. I got "parking meters", but none of them looked like they do in my country (and I've never heard anyone call them that word they used for translation). I got mark "mountains", but to quote Dundee: You call that a mountain?