Mazda 3 Owner's Manual page 246

Under the following conditions, the LDWS may not be able to detect white or yellow lines
correctly and the LDWS may not operate correctly.
If an object placed on the dashboard is refl ected in the windshield and picked up by the
camera.
Heavy luggage is loaded in the luggage compartment or on the rear seat and the
vehicle is inclined.
The tire pressures are not adjusted to the specifi ed pressure.
When the vehicle is driven on the entry and exit to or from the rest area or tollgate of a
highway.
The white or yellow lines are less visible because of dirt or paint fl aking.
The vehicle in front of your vehicle is running near a white or yellow line and the line
is less visible.
A white or yellow 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 due to
construction.
A misleading line is picked up on the road such as a temporary line for construction,
or because of shade, lingering snow, or grooves fi 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 windshield is dirty or foggy.
Back-light is refl ecting from 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 or yellow line is on the road.
The width of a lane is excessively narrow or wide.
The road is excessively uneven.
The vehicle is shaken after hitting a road bump.
There are two or more adjacent white or yellow lines.
There are various road markings or lane markings of various shapes near an
intersection.
Lane Departure Warning System (LDWS)
When Driving
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