Mazda 3 Quick Manual page 27

When Driving
Lane-keep Assist System (LAS) & Lane Departure Warning System (LDWS)
Vehicle lane line display
When the Lane-keep Assist System (LAS) & Lane Departure Warning System
(LDWS) goes from stand-by to operational status, the vehicle lane lines are
indicated in the multi-information display or active driving display.
Indication on display
System condition
Multi-information display Active driving display
Stand-by
Operation status
26
For details, refer to Section 4, "i-ACTIVSENSE".