This accident analysis document was posted by Roger in another thread:
http://www.hse.gov.uk/research/rrpdf/rr139.pdf
It contains (P65)
5.5.1 Influence Network Model
5.5.1.1 Background
The Influence Network was originally developed to model how human and organisational factors
could affect the likelihood of human error leading to accidents in hazardous environments (e.g. nuclear
power stations, petrochemical plants, aerospace).
The Influence Network approach for human performance was enhanced by BOMEL to cover human
and hardware performance at all levels in an organisation in a single analysis, thereby giving a
comprehensive approach to understanding the factors which influence the likelihood of human error or
hardware failure in the causation of accidents. This approach has rapidly gained wide
acknowledgement and has been applied in risk assessment and, perhaps more importantly, in the
development of risk reduction strategies for a variety of accident scenarios in a wide range of
industrial sectors. The structuring within the network gives coherence to fragmented information and
the quantification enables weaknesses and areas where change may achieve substantial benefit to be
identified.
And the overarching influence in the diagram (which I haven't reproduced) is termed: "Social, Political and Context."
This is exactly the approach that Safe Speed DEMANDS to deliver sustainable road safety impovements. We have to major on
cultural influence. Quite how it is that health and safety people know this and the DfT does not is one of the great mysteries of our struggle.
And of course while the DfT fails to understand the importance of cultural influence they keep pushing bad influences on us. No wonder road safety is getting worse.
(edited to correct user name of earlier poster)