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379. Which of the following is the most correct action to take when the driver of the vehicle ahead stretches his arm horizontally out of the left side of the vehicle?
- Slow down as the front vehicle is expected to turn right.
- Change lane to an upper lane as the vehicle is expected to cross.
- Overtake the vehicle as the front vehicle is expected to make a U-turn.
- Slow down as the front vehicle is expected to change lanes.
Answer : 4