Anyone who has ridden the New York subway at non-peak times will know to travel a crowded carriage for safety. Otherwise you will only have a few seconds to see the expressions of the other passengers and weigh up your chances of being robbed before deciding whether to take the train or not.
在美國紐約搭過地下鐵的人，若在非尖峰時段坐車，很自然的會走向人多的車廂以保安全，否則一定得在十幾秒間憑車上乘客的表情、眼神來衡量自己被搶的機率，再決定上車與否。