In their defense, unlike the states, Prague drivers do not yield to pedestrians at crosswalks.
When in the States, don't assume that drivers yield to pedestrians in all places. It varies. I was walking in New York City once and entered a marked crosswalk the same way I would anywhere else. My friends stopped at the curb. I didn't know why they stopped until I almost got smashed by a taxi. Lesson learned: I don't belong in NYC.