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

Manual For SafetyNet accident causation system (SNACS)
6.6 Example accident – detailed walkthrough
Below, a simplified example is given to show what the result of an analysis may
look like. The example accident is simple, to make the analysis procedure easy
to follow.
Kalle collides with another vehicle at an intersection when he is going grocery
shopping. It is a signalised 4-way intersection close to the city center. Kalle
wants to continue straight ahead, and drives into the intersection although he
has a red light. Another car, which has a green light and is coming from Kalle’s
left, strikes Kalle in his left side.
The accident investigation team arrives shortly. Through an interview on-scene
they find out that just prior to Kalle’s reaching the intersection his cell phone
rang, and he picked it up to see who was calling. Kalle also tells the
investigators that he was driving 50 km/h, and that he was feeling well and was
in no hurry. He claims that he saw the intersection long before reaching it and
saw that the traffic light was green, but he never noticed that it turned red. Kalle
also said that he was quite tired, because the previous night he had not slept
very well.
6.6.1 Evaluation of the Common Performance Conditions
First, we make an evaluation of the Common Performance Conditions for the
accident event using the CPC-template from Appendix A. Below, a small part of
the CPC table is shown:
ommon Performance Conditions - Dimensions, parameters and evaluation levels
CPC Parameters Explanations Comments Evaluation level /
influence on
driving
performance
Source
of info
(inspection of
car, interview
with driver, etc)
Quality of
info
very reliable (+)
reliable (0)
less reliable (0)
not reliable (-)
Design of traffic
environment
Type of traffic
environment
Important factors
Complexity
Information
What kind of traffic environment was
it
Within or outside urban area
Main road or highway
Any important factors which
significantly makes it easier to drive or
are there any risk factors (road
construction work, hidden exits,
unusually tight curve radius, holes in
the road, ect)
Within urban area Country road (0)
City traffic (-)
Nothing particular Several supportive factors (+)
No obvious risk factors (0)
Some risk factors (0)
Many risk factors (-)
How complex is the traffic
environment
Crossing roadways (crossing,
circulations, exits, etc)= complex
Several lanes in any/both directions =
moderately complex
One lane = not complex
Intersection Not complex (+)
Moderately complex (0)
Very complex (-)
Is the signing clear/easy to
Functioning traffic ligtht,
understand
adequately placed
Are the road markings clear
Is information provided early enough
for the driver to have time to react
Is crucial information missing which is
needed to pass the spot safely
Figure 7: Part of CPC evaluation for Kalle's accident
Supportive (+)
Adequate (0)
Tolerable (0)
Inappropriate (-)
inspection on
scene
inspection on
scene
inspection on
scene
inspection on
scene
very reliable (+)
very reliable (+)
very reliable (+)
very reliable (+)
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