Lexus CT200h Owner's Manual page 298

2-4. Using other driving systems
CAUTION

Hill-start assist control

Do not overly rely on hill-start assist control. Hill-start assist control may
not operate effectively on extremely steep inclines or roads covered in ice.

Unlike the parking brake, hill-start assist control is not intended to hold
the vehicle stationary for an extended period of time. Do not attempt to
use hill-start assist control to hold the vehicle on an incline for an
extended period of time, as doing so may lead to an accident.
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