How must priority vehicles signal their presence?
Right of way
Explanation
**Priority vehicles**, such as ambulances, police cars, and fire trucks, must effectively signal their presence when on an urgent service. To do this, they use **simultaneous light and sound signals**.
- **Light signals**: These vehicles are equipped with blue lights that are activated to indicate they are on an urgent service.
- **Sound signals**: In addition to the lights, they use sirens to emit sounds that alert other drivers and pedestrians to their presence.
The combined use of these signals is crucial for priority vehicles to **travel with preference** on all roads, as other drivers and pedestrians must yield to them. This ensures they can reach their destination quickly without endangering other road users.
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