TOYOTA 2011 Prius - Manual (Page 246)

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2-4. Using other driving systems
PRIUS_U (OM47685U) DVD
CAUTION
n To avoid operating the cruise control by mistake
Switch the cruise control off using the “ON-OFF” button when not in use.
n 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.
l In heavy traffic
l On roads with sharp bends
l On slippery roads, such as those covered with rain, ice or snow
l On steep hills
Vehicle speed may exceed the set speed when driving down a steep hill.
l On winding roads