August 4, 2026
A speed alert the driver does not switch off after ten minutes
A 3 km/h hysteresis band, cooldowns of 30/20/12 seconds, and one important exception: an escalation speaks immediately.
Engineering notes
Engineering notes
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July 9, 2026
When the map has no sign: inferring speed limits under Circular 31/2019
The OpenMapTiles schema carries no maxspeed tag. With free tiles, close to 100% of limits must be inferred — and here is where that inference can be wrong.
June 18, 2026
The head unit reports zero speed while the car does 60
Location.hasSpeed() returns true and the value is 0.0 — forever. Why this is so common on aftermarket Android units, and how the app detects it.