Table 4.

Risk Factor System of Unsafe Behavior of Subway Passengers

Stage	Symbol	Represented Content
Escalator	X1	Passengers use mobile phones or communicate with companions on escalators
	X2	Child playing on the escalator
	X3	Leaning on the escalator or taking the escalator with larger and heavier luggage
Subway station	X4	Pushing people away due to overcrowding
	X5	Fighting with nearby passengers
	X6	Littering causes other passengers to fall
	X7	Bring items that are prohibited in the subway station (eg pets, bicycles, etc.) into the subway station
	X8	Falls due to not looking at the road due to using a mobile phone while walking
Subway waiting area	X9	Go on boarding or alighting even after the door-close alarm sounded
	X10	Carrying luggage is too bulky to be caught when entering the door
	X11	Slow movement due to age, disability, etc. resulting in being caught when entering the door
Subway cars	X12	Scary rumors spread in subway cars causing panic among other passengers