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

Manual for SafetyNet accident causation system (SNACS) - Appendices
Traffic
environment
conditions
HMI – design
of the
interface
combination
Density of
traffic
Road
conditions/fri
ction
Visibility –
atmospheric
al conditions
and light
HMI= Human-Machine-
Interaction for the driver and
the vehicle:
Is the combination of different
interfaces adequate for the
driver or could it cause
problems
How many other vehicles were
in the surroundings Was it to
be considered high or low
density of traffic
If there exists knowledge on
the usual traffic flow for the
road(s), was traffic flow high,
normal or low in relation to
this
Was friction good or reduced
by ice, snow, water, etc
Dry asphalt=optimal
Dry asphalt and degrees
below zero= good
Wet road and degrees over
zero=good
Wet road and degrees below
zero=tolerable
Snowy road =tolerable/poor
Icy road= poor
Was the general visibility good
or was it deteriorated by
darkness, fog, snow or rain
Supportive (+)
Adequate (0)
Tolerable (0)
Inappropriate (-)
Light traffic (0)
Heavy traffic (-)
Optimal (+)
Good (0)
Tolerable (0)
Poor (-)
Optimal (+)
Good (0)
Tolerable (0)
Poor (-)
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