What is necessary for moving between lanes without obstruction or risk?

1. AIt is only necessary to ensure that the direction indicator signal is given during the transition.
2. BIt is necessary to communicate with the other drivers and give a signal three km before the transition.
3. CSignalling in time and from a sufficient distance, checking around in every direction and looking in the mirrors before beginning the transition.
4. DIt is necessary to signal with the direction indicator and the front lights during the transition.

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