Seatbelts have been shown to provide excellent protection for occupants of modern passenger cars. Yet, seatbelts have also been shown to cause some injuries, albeit generally less severe and not normally life threatening. Supplementary airbags in combination with seatbelt webbing clamps are expected to reduce seatbelt injuries by spreading the deceleration load on the torso and improving occupant kinematics during a crash. To date, however, there has been little scientific evidence in terms of field accident investigations to support this contention. The Monash University Accident Research Centre has undertaken several case-control studies of crashed vehicles equipped with airbags. Vehicle have been inspected and occupants interviewed using the National Accident Sampling System (NASS) format. Data were available for 140 belted drivers involved in frontal crashes (delta-Vs between 21 and 60 km/h), including 71 airbag and 69 control cases. The results showed indications of over-all benefits from the combination of airbags and webbing clamps, particularly in terms of a reduction in moderate and severe injuries and their associated costs. Indications of similar but smaller reductions were found when seatbelt injuries only were considered. As expected, airbags reduced chest injuries across a range of severities. However, an increase in minor shoulder injuries was found among the airbag cases This may result from changes to the occupant kinematics during a crash that stem from the combination of seatbelt webbing clamps and supplementary airbags.