[billy302]

Even on an old EF falcon data can be downloaded from the computer regarding engine revs and gear selection and I believe the G force in a collision, what triggered the airbag.
It is a known fact that hitting another car head on does not multiply the energy of the accident. The energy of that particular vehicle is absorbed by itself and nothing more.
Whether the Mercedes involved had airbags or not is not known, but I would suggest that it would have to be pretty old not to have them since Mercedes have been fitting them to all their cars since the late 70's.
The bottom line in this is the fact that the police don't believe his bulldust about how fast he was going