Lexus IS250 U Owner's Manual page 209

Turning the LDA system on
Press the LDA switch to activate the
system.
The LDA indicator and lane lines will
come on.
Press the switch again to turn the LDA
system off.
The LDA system will remain on or off
even if the engine switch is turned to
IGNITION ON mode.
Operating conditions
When the vehicle speed is approximately 32 mph (50 km/h) or more
●
When the lane width is more than approximately 8.2 ft. (2.5 m)
●
When driving on a straight road or through a curve with a radius of more than
●
approximately 328 ft. (100 m)
IS350/250_U (OM53C50U)
4-5. Using the driving support systems
209
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