Mazda 3 Owner's Manual page 306

When Driving
i-ACTIVSENSE
NOTE
Under the following conditions, the Lane-keep Assist System (LAS) & Lane Departure
Warning System (LDWS) may not be able to detect white (yellow) lane lines correctly
and it may not operate normally.
If an object placed on the instrument panel is re ected in the windscreen and picked
up by the camera.
Heavy luggage is loaded in the luggage compartment or on the rear seat and the
vehicle is tilted.
The tyre pressures are not adjusted to the speci ed pressure.
Tyres other than conventional tyres are equipped.
When the vehicle is driven on the guiding branch to or from the rest area or tollgate
of a highway.
The white (yellow) lane lines are less visible because of dirt or fading/patchiness.
A vehicle in front of your vehicle is running near a white (yellow) lane line making
it less visible.
A white (yellow) lane line is less visible because of bad weather (rain, fog, or snow).
The vehicle is driven on a temporary lane or section with a closed lane resulting
from construction where there may be multiple white (yellow) lane lines or they are
interrupted.
A misleading line is picked up on the road such as a temporary line for construction,
or because of shade, lingering snow, or grooves lled with water.
The surrounding brightness suddenly changes such as when entering or exiting a
tunnel.
The illumination of the headlights is weakened because of dirt or the optical axis is
deviated.
The windscreen is dirty or foggy.
The windscreen, camera is fogged (water droplets).
Back-light is re ected off the road surface.
The road surface is wet and shiny after rain, or there are puddles on the road.
The shade of a guardrail parallel to a white (yellow) lane line is cast on the road.
The width of the driving lane is narrow (less than about 2.5 m (98 in)) or wide (more
than about 4.5 m (178 in))
Driving on roads with tight curves.
The road is excessively uneven.
The vehicle is shaken after hitting a road bump.
There are two or more adjacent white (yellow) lane lines.
There are various road markings or lane markings of various shapes near an
intersection.
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