Earlier quoted context omitted.
In the US, pedestrian signals do NOT signal when it’s safe to cross. Cars almost always have a green in the same direction, meaning they can turn into you. I almost get run over once a month because of this.
When I visited the USA for a conference, I looked up a nice coffee place that was just across the street from the academic campus where I was staying. I went to the nearest crossing point, waited for several cycles of the traffic lights, and still couldn't deduce when it was safe to cross. The road markings were black and white stripes, which mean "cars must always stop for pedestrians crossing here" where I live (UK…
OTOH, especially at a busy intersection, if you're just standing on the sidewalk looking confused, a driver looking to make a turn is probably going to just shrug and turn right through the crosswalk. Some drivers will doubtless be overly aggressive or inattentive. But a random driver is also not going to sit there forever waiting for you to make up your mind about whether to cross or not.