Ford 2005 F250 Owner's Manual page 60

Driver Controls
Clearance lamps (if equipped)
Illuminates when the headlamps or
parking lamps are switched on.
This provides additional visibility of
your vehicle to other drivers on the
road.
Fold-away mirrors
The mirrors can be manually folded forward or backwards for narrow
spaces like driving through an automatic car wash or backing out of a
garage with the trailer tow mirror.
The telescoping feature (if equipped) allows the mirror to extend
approximately 3.15 inches (80 mm). This feature is especially useful to
the driver when towing a trailer.
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