Honda 1991 Prelude Owner's Manual page 62

The four wheel steering system (4WS) provides limited steering of
the rear wheels, in addition to the normal steering of the front
wheels. The system is "steering angle dependent." That is,
depending on how far the steering wheel is turned, the rear wheels
are steered in either the same or the opposite direction of the front
wheels.
When the steering wheel is turned a
m o d e r a t e
approximately one half turn, the
rear wheels are steered in the same
direction as the front wheels. For
example, during lane changing and
on gentle curves, the front and rear
wheels steer in the same direction.
When the steering wheel is turned
more than approximately one half
turn, the rear wheels are steered in
the opposite direction of the front
wheels. This reduces the turning
radius of the car for easier parking,
U-turns, and maneuvering in
confined spaces.
Four Wheel Steering (Si with 4WS)
a m o u n t , u p
Moderate turns
t o
Same direction
Moderate turns
Conventional steering
4WS
Sharper turns
Opposite direction
Sharper turns
(cont'd)