Ford 2006 Expedition Owner's Manual page 610

Seating and Safety Restraints
Your vehicle has LATCH anchors for child seat installation at the seating
positions marked with the child seat symbol:
Never attach two LATCH child safety seats to the same anchor.
In a crash, one anchor may not be strong enough to hold two
child safety seat attachments and may break, causing serious injury or
death.
The lower anchors for child seat
installation are located at the rear
section of the second row seat
between the cushion and seat back.
The LATCH anchors are below the
locator symbols on the seat back.
Follow the child seat manufacturer's instructions to properly install a
child seat with LATCH attachments.
202
2006 Expedition (exd)
Owners Guide (post-2002-fmt)
USA (fus)