The beeps are interesting, though 90db still seems like it might be loud. I agree that the horn is too rude for pedestrians. I usually pull the clutch in and rev the motor a bit, or just yell, "Hello there!" as they are blissfully walking out into the street without looking.
Twenty-one people were struck and killed by drivers while walking the streets of San Francisco last year, the highest number of pedestrian deaths since 2007 in a city where three people on an average day get hit by cars or trucks.
Maybe I DO need a beeper! And maybe it needs to be 90db to compete with engine sounds of motos, cars, trucks, buses, tire sounds, as well as the general background of urban roar.