  We develop a modified version of the totally asymmetric simple exclusion
process (TASEP) and use it to reproduce flow on an escalator with two distinct
lanes of pedestrian traffic. The model is used to compare strategies with two
standing lanes and a standing lane with a walking lane, using theoretical
analysis and numerical simulations. The results show that two standing lanes
are better for smoother overall transportation, while a mixture of standing and
walking is advantageous only in limited cases that have a small number of
pedestrians. In contrast, with many pedestrians, the individual travel time of
the first several entering particles is always shorter with distinct standing
and walking lanes than it is with two standing lanes.
