A sill assembly includes an integral sill assembly having a sill base and an inclined threshold. The device comprises an allocation manager that allocates an identifier to a lift cabin carrying out a transport job and a display at a boarding location that outputs an identifier of a lift cabin. In some embodiments, it is possible to examine an upper andor lower eye\u2014for example, a lower eye slightly above a supporting surface. Otherwise, the two devices may operate at or below nominal eye safety limits.