Naive coordinate broadcasting costs the square of the crowd — everyone talks to everyone. StreetWizard attacks that cost by sending less, not by routing differently: riders share one realtime channel, and heavy identity travels through presence exactly once.
The position stream is then deliberately starved. Emission is gated on elapsed time AND distance moved, and both thresholds step up with fleet size — a convoy of twelve emits about twice a second, a swarm past two hundred backs off to once every four seconds. Density becomes an asset rather than a liability: bandwidth per rider falls as the crowd grows.

