While travelling in the traffic stream, the driver who was travelling in the adjacent lane abruptly changed into your lane, forcing you to brake. What must you do in this situation?

• 1Give a light signal with the headlights.
• 2Overtake the violator, change lanes in front of him into his lane, and brake sharply.
• 3At the nearest traffic light, on the prohibiting signal, approach his car and reprimand the violator.
• 4None of the listed actions is permissible.