I travel early in the AM through mostly residential streets. I often wave, though more often just say "Yo" as a greeting, loud enough to be heard. I do encounter some peds, cyclists, and drivers repeatedly and I give them names; over the years there have been "good buddy, "the fleet goddess, and "the stalker." Some I have met personally and know them as Louie; Ed and his dog, the Chief; and Marianne.
Sometimes I get friendly honks, but cannot always recognize the drivers, and sometimes people say they saw me, but didn't want to startle me with a honk.