Toyota PRIUS ALPHA 2012 Quick Reference Manual page 307

NOTICE
■
In the following situations, the LKA will not work, or will not perform
reliably:
●
When lane markers are interrupted or are not present, such as before a
tollbooth.
●
When lane markers are only on one side of the road.
●
When driving on a sharp curve.
●
When lanes are extremely narrow or extremely wide.
●
When the vehicle leans to one side an unusual amount due to a heavy
load or improper tire inflation pressure.
●
When the following distance between your vehicle and the vehicle ahead
is extremely short.
●
When the lane markers are broken, "Botts' dots", or "Raised pavement
marker".
●
When lane markers are obscured or partially obscured by sand, dirt, etc.
●
When driving on a particularly bright road surface, such as concrete.
●
When driving on a road surface that is bright due to reflected light.
2-4. Using other driving systems
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