Toyota Tacoma 2018 Owner's Manual page 269

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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
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When your vehicle is pointing upwards
(caused by a heavy load in the luggage
compartment, etc.)
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Preceding vehicle has an extremely high
ground clearance
4-5. Using the driving support systems
269
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