Dangerous lift, boy looses life

A boy died in the lift of an apartment under construction while playing inside the lift. The lift moved with boy's leg between the lift door and the wall. The lift stopped after moving some distance by which boy died. A case was registered on lift maintenance agency under IPC for rash/negligent act.
It is not clear from the reports,  how the lift is allowed for use without interlock between lift movement and door position. It is not clear from the news, whether the door is foldable grill type and the boy while playing put his leg through openings of the grill and somebody in someother floor pressed the button causing the lift to move.

Difference between danger, warning, caution

I was not clear about what is a danger sign, what is a warning sign and what is a caution sign, till I read this article in Safety Daily Advisor. It also explains about biological hazard sign and instructions.
Danger sign is about a hazard that can lead to death, warning sign is about potential hazard and caution sign is in-between.

Whatever be the display of signs, the articles mentions, that if one can't understand what it means and what should be done, then it serves no purpose.

It's better to provide training and provide booklets containing the information to all employees. Also, display the measures to be taken, near the area where it can be seen by the employees.