Share speed and alert erratic driving
I suggest expanding the 'Share ETA' feature into an active safety pairing mode. When sharing a drive with a trusted, close contact, they should see a real-time telemetry dashboard that includes:
Live Speed vs. Speed Limit: Display my current speed next to the local speed limit so they know I'm navigating conditions safely.
Sudden Deceleration Alerts: A proactive notification if the vehicle drops speed abruptly (e.g., braking from 65 mph to 0 mph in 3 seconds), indicating a potential hazard or sudden traffic wall.
Erratic Driving Flags: If the phone's gyroscope and GPS detect sudden, repeated swerving or erratic braking, the observer is quietly notified so they can call to check on the driver (useful for fatigue or medical issues).