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Under the Road Traffic Act and its regulations, which TWO are correct about the rules emergency vehicles must observe?

1. ①An emergency vehicle that enforces against speeding vehicles must have the emergency-vehicle structure set out in the standards for safe vehicle operation.
2. ②An emergency vehicle used officially for protecting domestic or foreign dignitaries need not sound a siren or turn on warning lights.
3. ③Even if an ordinary vehicle turns on its headlights or hazard lights to show it is on an urgent mission, it cannot be regarded as an emergency vehicle.
4. ④As a rule, an emergency vehicle receives priority passage and the legal exceptions only when it sounds a siren or turns on warning lights.

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