Lexus 2013 IS250 Owner's Manual page 246

244
4-5. Using the driving support systems
Indication on the multi-information display
When the inside of both lane lines
turn white:
Indicates that both right and left
lane markers are recognized.
If the vehicle deviates from the lane,
the lane line on the side the vehicle
has deviated from will flash in yel-
low. (P. 482)
When the inside of either lane line
turns white:
Indicates that the lane marker on the
white-marked side is recognized.
If the vehicle deviates from the side
of a lane with recognized lane mark-
ers, the lane line will flash in yellow.
(P. 482)
When the inside of both lane lines
are black:
Indicates that no lane markers are
recognized or the LDA system is
temporarily canceled.
IS250_EE(OM53B11E)