Concise, highly specific intel “streetcraft” series about practical street smart skills, urban guidelines, concepts and methodologies for covert operatives and civilians in the form of proverbs and quick tips.
Police sirens and ambulance sirens, while both loud and distinct, have different sounds to allow for the identification of the approaching vehicle type, even when visibility is limited. A police siren usually has a high and low pitch that alternates, creating a classic “wail” sound effect. In many places, this is typically a rapid, oscillating sound that fluctuates between high and low tones swiftly. This is intended to be piercing and immediately noticeable, allowing police to alert drivers and pedestrians of their presence as they navigate through traffic during an emergency situation.
On the other hand, ambulance sirens often emit a sound commonly referred to as a “phaser” or “yelp.” This siren is a rapid up-and-down tone that changes pitch at a faster pace than a police siren. The ambulance siren might also include a secondary, low-frequency “rumble” sound that can be felt as well as heard, particularly useful in heavy traffic where higher frequency sirens may be drowned out by other noise. The combination of these sounds creates an urgent, highly noticeable signal designed to encourage other road users to move aside and clear a path as quickly as possible, to facilitate the fastest possible response to a medical emergency.
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