Toyota PRIUS Owner's Manual page 349

●
Vehicles with small rear ends (trailers with no load on board, etc.)
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Motorcycles traveling in the same lane
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When water or snow thrown up by the surrounding vehicles hinders the
detecting of the sensor
●
When your vehicle is pointing upwards
(caused by a heavy load in the luggage
compartment, etc.)
●
Preceding vehicle has an extremely high
ground clearance
PRIUS_OM_OM47A31E_(EE)
4-5. Using the driving support systems
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