How do seatbelts “sense” that the belt is being pulled abruptly and lock the belt so it does not extend? - Quora
![Sensors | Free Full-Text | Development of an Emergency Locking Unit for a Belt-In-Seat (BIS) System Using a MEMS Acceleration Sensor Sensors | Free Full-Text | Development of an Emergency Locking Unit for a Belt-In-Seat (BIS) System Using a MEMS Acceleration Sensor](https://pub.mdpi-res.com/sensors/sensors-10-03759/article_deploy/html/images/sensors-10-03759f1-1024.png?1403312377)
Sensors | Free Full-Text | Development of an Emergency Locking Unit for a Belt-In-Seat (BIS) System Using a MEMS Acceleration Sensor
![The Car Seat LadyLocking the Seat Belt (also known as engaging the automatic locking retractor) - The Car Seat Lady The Car Seat LadyLocking the Seat Belt (also known as engaging the automatic locking retractor) - The Car Seat Lady](https://thecarseatlady.com/wp-content/uploads/2017/04/retractorlocation-e1493221344307.png)
The Car Seat LadyLocking the Seat Belt (also known as engaging the automatic locking retractor) - The Car Seat Lady
![The Car Seat LadyLocking the Seat Belt (also known as engaging the automatic locking retractor) - The Car Seat Lady The Car Seat LadyLocking the Seat Belt (also known as engaging the automatic locking retractor) - The Car Seat Lady](https://thecarseatlady.com/wp-content/uploads/2017/04/freesliding.001.png)