Mazda 3 Quick Manual page 26

When Driving
Lane-keep Assist System (LAS) & Lane Departure Warning System (LDWS)
System Operation
If the LDWS OFF indicator light in the instrument
cluster turns off when the ignition is switched ON,
the system goes on standby.
If the LDWS OFF indicator light in the
instrument cluster turns on when the ignition is
switched ON, press the LDWS OFF switch so
that the system goes on standby.
Drive the vehicle in the centre of the vehicle lane while
the system is on standby. The system becomes
operational when all of the following conditions are met.
• The vehicle is driven in the centre of the driving lane with the white
or yellow lines on the left and right sides, or on either side.
• The vehicle speed is about 70 km/h (44 mph) or faster.
• The vehicle is driven on a straight road or road with gentle curves.
Other conditions are described in the related text.
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For details, refer to Section 4, "i-ACTIVSENSE".