Bibek

RoadWatch is an autonomous multi-agent pavement surveyor that grades road condition at scale using Mapillary street-level imagery — no custom CV model, no windshield survey crew, no $250k engineering contract. A 3-tier Opus 4.7 hierarchy works like a field crew: Street Captain (1×) plans the inspection route, dispatches survey teams, synthesizes a corridor narrative Point Surveyors (up to 3×, parallel) investigate each survey point across all available years — cross-witnessing temporal change Year Investigators (up to 2× per Surveyor, parallel) examine the same spot from different epochs, sharing claims on a blackboard so siblings can anchor their yaw angles Peak concurrency: 6 simultaneous Opus 4.7 calls. The discipline gate is deterministic — it inspects the visit log and refuses a grade() call if multi-year coverage exists but only one year was examined. A SHA-256 collision detector identifies when "multi-year" listings are actually the same image with backdated metadata — surfacing a data integrity problem invisible to any pipeline that trusts timestamps. The web UI lets a public-works engineer draw a polygon, select streets, watch the agent hierarchy work in real time — cursors walk the block, evidence cards stream in, the map recolors as grades land. One click, ~$5, any street in the world with Mapillary coverage. Validated: Spring St LA, Chestnut Ventura, SoHo Broadway. Calibrated against LA's published 69,282-segment PCI dataset.