Buick 2001 LeSabre Owner's Manual page 157

The information may be displayed in English or metric
units and appears as a reflection in the windshield.
The HUD consists of the following information:
D
Speedometer Reading
D
Turn Signal Indicators
D
-
High Beam Headlamp Indicator
D
Check Gages Message
2-92
The HUD shows these images when they are lighted on
the instrument panel cluster.
Be sure to continue scanning your displays, controls
and driving environment just as you would in a vehicle
without HUD. If you never look at your instrument
panel, you may not see something important, such as
a warning light.
NOTICE:
Although the HUD image appears to be near the
front of the vehicle, do not use it as a parking aid.
The HUD was not designed for that purpose.
If you try to use the display as a marker for the
front of your vehicle, such as in a parking lot,
you may misjudge distance and hit an obstacle
or another vehicle.