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Bremen Deploys Tram AI to Flag Aggression in Real Time

Federal funding supports a 15‑tram pilot that draws scrutiny over false alerts alongside disputed data retention.

Overview

  • BSAG introduced the AI-Watch system that analyzes onboard camera feeds and alerts drivers and the control center when it detects aggressive or dangerous behavior for immediate assessment and possible police notification.
  • The technology was developed with Bremen start-up Just Add AI and was refined in staged “theatre rides” to reduce misclassification of gestures and scuffles.
  • About 15 streetcars are currently equipped, with installation planned on roughly one third of the fleet by year’s end and longer-term expansion envisioned to all trams and buses.
  • BSAG says video is processed locally with automatic face pixelation and no use of personal data for training, in coordination with the state data protection officer.
  • Independent reporting cites 72-hour onboard storage and police access to non-anonymized footage, while pilot data show false positives, including 16 flagged cases with only four confirmed in one test run.