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In-Depth Information
VIVRE2 system), stress and performance. The tools destined for the evaluation of
systems were made up of observation grids completed in real time by the researcher
(number of users detected, knocked over, avoided, times when the system was set
off) and questionnaires in the form of Likert
8
scales (see Table 7.3). A final
questionnaire at the end of the experiment asked the drivers to choose which system
they would advise installing on future trucks regularly circulating in an urban
environment. These questionnaires were completed by feedback in the form of an
individual psychological interview with each driver. The objective of this interview
was to check that situations during which the drivers had potentially knocked over a
vulnerable user had not caused a psychological shock.
PROPOSALS DESCRIBERS
What do you think of active braking?
Active braking is
from
Awkward
to
Not awkward
In terms of security active braking is
from
Inefficient
to
Efficient
The use of active braking in driving is
from
Unpleasant
to
Pleasant
With active braking driving it is
from
Disrupted
to
Facilitated
Globally active braking is
from
Useless
to
Essential
What do you think of the pictograms on the display?
For safety, pictograms are
from
Inefficient
to
Efficient
During driving, display of pictograms is
from
Awkward
to
Not awkward
With pictograms, driving is
from
Disrupted
to
Facilitated
Globally pictograms are
from
Useless
to
Essential
The information given by pictograms is
From
Incomprehensible
to
Comprehensible
Globally what do you think of the rear detection system?
The use of the system seemed
from
Difficult
to
Simple
For maneuvers the system is
from
Unpleasant
to
Pleasant
Globally the system is
from
Useless
to
Essential
With the system, the maneuvers in town
are
from
Disrupted
to
Facilitated
In terms of safety, the system is
from
Inefficient
to
Efficient
Table 7.3.
Examples of questions comprising the Likert scales
The results of this evaluation on a simulator were very conclusive regarding all
the dimensions that were chosen. The auto-evaluation of the mental work-load of
8 Our Likert scales were presented in the form of a continuous line 10 cm in length, without
graduation and with a description at each extremity. The descriptions are antonyms and the
drivers had to position themselves by drawing a mark with a pencil on the line that they felt
best reflected their evaluation.
