Glossary of Data Variables for Fatal and accident causation ... - ERSO

Manual For SafetyNet accident causation system (SNACS)
The CPC cover two general areas; the general driving conditions at the scene,
and the driver’s general condition (or drivers, for multiple vehicle accidents).
The CPC for SNACS are the following:
Common Performance Conditions
CPC
Parameters
Design of traffic
environment
Design of driver
environment
Traffic environment
conditions
Driver conditions
Adequacy of training
and experience
Type of traffic environment
Important factors
Complexity
Information
Physical environment
HMI – design of indiviual interfaces
HMI – design of the interface combination
Density of traffic
Road conditions/friction
Visibility – atmospherical conditions and light
Visibility – Obstructing elements
Physical and mental health
Speed (compared to signs)
Time of day and week
Number of simultaneous goals
Driving experience
Driver’s aquaintance with traffic environment
Driver’s aquaintance with the vehicle
Driver’s education (procedures, regulations, special vehicle training)
Figure 4: Common Performance Conditions for SNACS
A detailed description on what the CPC stand for, as well as how to evaluate
them, can be found in Appendix A; “CPC-template”.
The main purpose of the context evaluation through the CPC is to frame the
situation. The contextual conditions can give clear hints as to which types of
causes are more likely than others to have brought about the accident. If the
conditions were particularly demanding in one or more of the CPC dimensions,
then causes related to these conditions are more likely connected to the event.
For example, suppose that you are analysing an accident where the driver has
departed the roadway. If the CPC evaluation shows that the road conditions
were poor due to patches of ice on the road, then causes relating to
misjudgement of the road friction are likely. If, on the other hand, the road was
dry, such causes are much less likely.
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