Lexus 2013 IS250, Owner'S Manual

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4-5. Using the driving support systems
IS250_EE(OM53B11E)
CAUTION

To avoid operating the cruise control by mistake
Switch the cruise control off using the “ON/OFF” button when not in use.

Situations unsuitable for cruise control
Do not use cruise control in any of the following situations.
Doing so may result in loss of control and could cause an accident resulting in
death or serious injury.

In heavy traffic

On roads with sharp bends

On winding roads

On slippery roads, such as those covered with rain, ice or snow

On steep hills
Vehicle speed may exceed the set speed when driving down a steep hill.

When your vehicle is towing a trailer or during emergency towing