In NYC it is required.

The change comes from RCNY 3610-05 and in 2018 adds a new section of ASME A17.1 Section 2.16.10 And this is what requires "Detection of Overload on Passenger Elevators and Freight Elevators Permitted by 2.16.4 to carry Passengers"

Not sure if this helps but might give you somewhere to start.