Correct answer
With the direction indicators.
As a general rule, to signal your intention to change lanes, the driver must use the direction indicators. This involves the following steps: Carefully observe that the manoeuvre can be carried out without obstructing or endangering other road users. Signal your intention after checking that the manoeuvre can be carried out safely. This is done using the vehicle's direction indicators (indicator lights) or, failing that, by extending your arm in the corresponding position. Carry out the lane-change manoeuvre bearing in mind that vehicles travelling in the lane you wish to move into have priority and must be given way. The manoeuvre must be carried out gradually, without sudden swerving and without obstructing the progress of other vehicles on the road.
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With the horn.
With the brake lights.
With the direction indicators.
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