When looking left or right is not anymore safe.

Take a look at this scene: A woman crossing the street, looking to her left then to her right. She was on her way crossing the street, when a car, careening at top speed down the street, hit her then went on its way, leaving the blooded woman sprawled on the street, dead. Or this: A man hastily crossing the street suddenly slipped and fell, in the way of an incoming vehicle. He got hit, went flying a few feet, then landed, battered but alive, on the pavement, while the driver of the vehicle rushed over and try to get help