While travelling in the traffic flow, a driver who was travelling in the adjacent lane abruptly changed lanes 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 signal that prohibits travel, approach his car and reprimand the violator.
• 4None of the listed actions is permissible.