As devastating high-rise fires continue to highlight the terrifying limitations of traditional emergency exits in high-density societies.

A 72-year-old woman died in a fire on the 19th floor of an East Harlem high-rise after firefighters had to traverse the stairs because elevators were not working, according to the fire department. The ...

Conventional elevator leveling relies on sensors mounted to the shaft. Building settlement, mechanical vibration, and routine service operations cause these sensors to drift out of alignment over time ...