You are approaching a junction intending to turn left. A cyclist is positioned ahead of you, near the left kerb. Which of the following actions is essential for safety?

1. Sounding your horn to ensure the cyclist knows you are behind them.
2. Overtaking the cyclist quickly before you reach the junction.
3. Assuming the cyclist is also turning left and following them closely.
4. Holding back and staying behind the cyclist until they have cleared the junction.