Correct answer
Unbalanced wheels.
Unbalanced wheels may transmit vibrations to the steering wheel, particularly at certain speeds. Balancing corrects mass distribution in the wheel-and-tyre assembly; alignment corrects steering and suspension geometry. Persistent vibration requires professional inspection to identify its cause, rather than continuing to increase speed.
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Coolant being at its normal temperature.
Unbalanced wheels.
The position lights being switched on.
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