Pre Tensioned Front Seat Belts.

The front seat belts are now very much inertia operated. This type of belt gives the driver the ability to move around without too much restriction. 
In the event of an impact the inertia seat belt is designed to grip the belt and not allow the occupant  to travel forward any more than they already are.

A seat belt pre tensioner is a device which physically explodes on impact similar to an air bag.

Vauxhall Corsa seat belts with tensioners.

When the tensioner is activated it pulls the tension onto the seat belt. 
In taking up the slack it enhances the grip on the occupant which may only be a couple of inches in the belt but may make the difference between a bruised head or a hole in it.
A superior safety feature which is very much underestimated.

 

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