Lincoln NAVIGATOR 2015 Owner's Manual page 237

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WARNING: Always make sure that the floor mats are properly
attached to the retention posts in the carpet that are supplied
with your vehicle. Floor mats must be properly secured to both
retention posts to make sure mats do not shift out of position.
WARNING: Never place floor mats or any other covering in the
vehicle foot well that cannot be properly secured to prevent them
from moving and interfering with the pedals or the ability to control the
vehicle.
WARNING: Never place floor mats or any other covering on top
of already installed floor mats. Floor mats should always rest on
top of vehicle carpeting surface and not another floor mat or other
covering. Additional floor mats or any other covering will reduce the
pedal clearance and potentially interfere with pedal operation.
WARNING: Check attachment of floor mats on a regular basis.
Always properly reinstall and secure floor mats that have been
removed for cleaning or replacement.
WARNING: Always make sure that objects cannot fall into the
driver foot well while the vehicle is moving. Objects that are
loose can become trapped under the pedals causing a loss of vehicle
control.
WARNING: Failure to properly follow floor mat installation or
attachment instructions can potentially cause interference with
pedal operation causing a loss of vehicle control.
Driving Hints
To install the floor mats, position the floor
mat eyelet over the retention post and
press down to lock in position.
To remove the floor mat, reverse the
installation procedure.