Correct answer
The effort required when turning the steering wheel
It reduces the effort needed to turn the steering wheel by assisting wheel steering. It does not itself improve visibility on bends or remove the need for control and observation. Its condition does matter for safety; with a fault or warning, follow the manual and do not continue if you cannot control the vehicle safely.
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The effort required when turning the steering wheel
The occupants' safety
Visibility of the road on bends
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