  The conjugated forces model (CFM) capable of reproducing bypassing behaviour
is proposed and adopted to simulate pedestrian evacuation. Primarily, the
concept of collision and evading and surpassing behaviour is particularly
defined to describe the proposed CFM. A pedestrian whose behaviour can be
described by the CFM will change his desired direction when confronted with a
collision, and choose to actively bypass others. Secondly, pedestrian movement
in a passageway is simulated to testify the capacity of the CFM to reproduce
microscopic bypassing behaviour, and the bypassing parameter is then introduced
to describe different movement strategies. Finally, Evacuation form a one-exit
room is simulated to find the optimal bypassing strategy. It is concluded that
the optimal bypassing strategy varies with different exit width and initial
pedestrian number.
