It is the maximum that is safe (3 wide has a person in the middle with no handrail and if anyone fell, they would become a bowling ball). It is much more effic

It is the maximum that is safe (3 wide has a person in the middle with no handrail and if anyone fell, they would become a bowling ball). It is much more efficient than 1 person wide - two double-wide escalators offer more capacity than the 3 single-wides that fit in the same space, and likely consume less energy and cost less to maintain.