One long hold — aggressive A gentle “beep beep”, seems more friendly. At least, to me, and I hope that’s how it’s perceived.

I do the beep beep at red-turn green lights, but try to wait a little. It’s midly annoying if a driver doesn’t react quick enough but driving is a frustrating enough experience as it is. No need to add fuel to the fire, so to speak. I’ve been beeped at the moment the lights turned green, and at the time, my foot was already pressing the gas. I felt embarrassed… my car does not react that quickly!

Trucks in SEA often do, they have this warbling "hey, I'm here", and then a much more aggressive "get the fuck out of the way!". People also modulate their bike horn to just give a little chirp so the person you're passing knows you're there, or two to say thank you, 3+ loud ones to say "get out of the way", etc