Robots share space with technicians and line workers, often amid high ambient noise and visual clutter. Audio complements beacons and stack lights to make intent legible without eye contact.
Primary goals: safety (approach, reverse, stop), state clarity (auto/manual, teach mode, fault), and auditory cues.
Key cues: pre-motion “about to move,” live-motion ticks linked to speed, “guard open/locked,” cycle complete, fault vs. critical stop (kept acoustically distinct).

Aisles, blind corners, and mixed traffic with humans and forklifts demand presence and vector information.
Primary goals: collision avoidance, flow efficiency, and operator/bystander comprehension.
Key cues: intersection “corner ping,” speed-scaled reverse beacon, “yielding to pedestrian,” docking/charging sequence, obstruction vs. reroute.

Environments with strict noise policies and sensory-sensitive populations. Trust and comfort are as important as detectability.
Primary goals: low-stress presence, gentle but unmistakable cautions, and clear critical alarms reserved for genuine hazards.
Key cues: “approaching bed,” handoff/assist window, medication/asset delivery, obstruction, call-for-help acknowledgment.

Guest-facing machines need to be both legible and likable while navigating crowds.
Primary goals: approachability, predictable interactions, and brand presence that reinforces the venue’s tone.
Key cues: “hello/approach,” tray extend/ready, request accepted, path blocked (polite nudge), arrival/thank-you.

Stores are acoustically reflective and visually busy; staff attention is split.
Primary goals: announce location and intent without startling shoppers; accelerate task handoffs.
Key cues: “passing behind you,” shelf scan start/complete, assistance requested/acknowledged, low battery (deferred) vs. immediate hazard.

Homes vary wildly in acoustics and user expectations; privacy and quiet hours matter.
Primary goals: unobtrusive guidance, human-readable states, and an approachable persona.
Key cues: wake/ready, start/stop cleaning, obstacle/cord detection, bin full, “do not disturb,” bedtime transition.

Mobile platforms move faster and interact with pedestrians; cues must project ahead.
Primary goals: conspicuity at low speeds, intent at crosswalks, and state communication to attendants.
Key cues: low-speed pedestrian alert, turn/merge indicators (non-visual adjuncts), autonomous → manual takeover request, fault/limp-home.

Outdoor noise floors shift with wind and machinery; operators may be tens of meters away.
Primary goals: distance audibility, role-specific prompts (operator vs. bystander), and minimal wildlife disturbance.
Key cues: start/stop pass, blockage/row end, chemical spray active/inactive, geofence breach, return-to-base.

Hazard-rich sites with PPE, engines, and radios. Eye contact is rare.
Primary goals: unmistakable hazard cues and concise task confirms that punch through noise.
Key cues: “entering work zone,” load secure, path blocked, reversing, E-stop, remote takeover.

High-stakes tasks under stress; operators may rely on audio while eyes are elsewhere.
Primary goals: unambiguous state/health reporting, silent/low-signature modes when required, and haptics/visual redundancy.
Key cues: arming/disarming, link quality, battery/thermal thresholds, mode changes (manual/auto/hold), return-to-home.

Mixed audiences with varied hearing and expectations; demos must be instantly legible.
Primary goals: teachability, engagement without annoyance, and resilience to echoic spaces.
Key cues: attention/get-ready, question acknowledged, demo start/stop, success/failure with clear affect.