On the subway, some passengers prefer to move to the junction of two cars, but this is not safe.
The carriage junction has a scientific name for "Tall".
Throughway. 
The throughway is an important part of connecting the two carriages, which can play a role in safety protection, provide a safe and reliable passage for passengers, and at the same time play the role of sound insulation, dust and rain.
During the train journey, the movement between the carriages is relative, which causes the junction to shake greatly, and passengers can easily stand unstable or fall.
There are generally no tabs for passengers to grasp at the joints, only handrails, so under the action of centrifugal force, the passengers standing here enter the curve of the train.
or it may be difficult to grasp the center of gravity in the event of an emergency braking.
In addition, there are folding windshields at the junctions of the carriages to play the role of turning and buffering.
When the train turns or goes up and down hills, the baffle will be crushed and deformed.
Where it would have been stretched, it could be compressed at any time, if the child was playing on the windshield.
Or if the passenger's hand is accidentally placed on it, it is easy to be pinched.
Therefore, please do not stay at the piercing for a long time
Do not leave luggage items here
Do not lean on the side panels to avoid being pinched.
If you need to stay for a moment, stand firm.
If you accidentally drop an item in the gap of the throughway, keep in mind the location of the carriage, inform the staff in time, and do not use your hands or other items to hook it up by yourself to avoid personal injury.
*: CCTV.