Off post?
Story of my life.
Hey, we mentioned Hi-lo and my wigwags happened to synchronize with it, so not so off topic.
(The generic tylenol I recommend to you is recalled due to metal fragments in the capsules.)
Hi-Lo works well on highways or anywhere everyone is stopped or moving slowly.
Hi-Lo is pleasant.
It is also gentle and does not convey the more forceful demand to clear out of the way as Wail and Yelp do.
I was traveling down the R shoulder of I-270 so no one needed move.
I would have preferred silence, but was concerned someone may move right without looking (who would expect a vehicle to be traveling in the shoulder?) so Hi-Lo could help avoid a problem.
Still, I always watch for turn signals or any sign someone is intending to move into my path.
I also pressed the Manual button while in Hi-Lo.
It caused a D natural which I inserted between the C and E major third
interval of the Unitrol 480 K.
I'd prefer this Hi-Lo be a C and D major second interval.
I should contact Unitrol to see if I can change the notes.
(I slowed the Yelp in our old 800 siren by adding capacitance to the appropriate circuit.)
Later, with traffic now moving, with really effective headlights, vehicles way ahead moved right out of lane one so I was able to travel in silence.
At those quiet times I call other law enforcement agencies ahead whose jurisdictions I'll be entering.
So there are good reasons to be silent:
To disturb the peace as little as possible
To talk to police dispatch
To listen for other responding emergency vehicles
To lessen aural fatigue.
To annoy people like you who like sirens!