Lincoln 1997 Town Car Owner's Manual page 175

The Steering Assist Switch (if equipped), located on
the instrument panel, allows the driver to select
how the steering effort changes with vehicle speed.
In the standard position, the steering effort increases
at about the same rates as the vehicle speed
increases. If the driver prefers lighter steering efforts,
the switch should be in the "LO" position where
steering effort will remain low, until highway speeds
are reached. If the driver prefers heavier steering
efforts, the switch should be in the "HI" position
where steering effort will increase at lower speeds.
172
Effort vs. vehicle speed chart
NOTE: The Steering Assist Switch position will not
change the steering efforts when the vehicle is
stopped or at very low speeds (0-10 mph,
0-16 km/h).