Traffic **officers** use **optical and acoustic signals** to direct traffic. These signals are essential for maintaining order and safety on the roads.

- **Optical signals**: Officers can use **arm signals** to indicate to drivers that they must stop or slow down. For example, when an officer extends their arm, it acts as a visual barrier for approaching vehicles. Additionally, they can use **lights** from a vehicle, such as a flashing red or yellow light, to indicate to drivers that they must stop and follow the officer's instructions.


- **Acoustic signals**: Officers also use **whistles** to give sound indications. These sound signals complement the visual signals and help capture the attention of drivers, especially in dense or noisy traffic situations.

In summary, traffic officers combine **optical** (visual) and **acoustic** (sound) signals to effectively direct traffic and ensure road safety.