Autoliv's load limiters minimize the risk for rib fracture from the seatbelt in very violent crashes. This is especially important for elderly, since studies have shown that a 60 year old person can only take half as much load on his rib cage as a twenty year old person.
Load limiters keep the belt force at a controlled and pre-defined level. This is accomplished by a mechanism in the retractor that allows webbing to be pulled out slightly - and in a controlled way - if the load on an occupant's body becomes too high in a violent crash. The system is typically used in combination with an airbag which then absorbs the excessive energy.