Assisting the older driver - SWOV

Assisting the older driver
Diseases and
disorders
Having difficulties with
certain manoeuvres
Some assistance would
be nice
None
(n=90)
One or
more
(n=15)
No or
only one
(n=43)
Yes, with
two or
more
(n=62)
No or only
with one
manoeuvre
(n=50)
Yes, with
two or
more
(n=55)
Priority regulation
Usefulness 0.23 1.20*** 0.02 0.62** 0.00 0.71***
Satisfaction ‐0.43 0.63*** ‐0.61 ‐0.04* ‐0.67 0.08***
Safe gaps
Usefulness 0.07 0.93* ‐0.31 0.55*** ‐0.23 0.58**
Satisfaction ‐0.34 0.48** ‐0.70 0.12*** ‐0.71 0.23***
View of the
intersection
Deviating
rules/situations
Usefulness 0.41 1.19*** 0.20 0.74 0.21 0.80*
Satisfaction ‐0.19 0.43 ‐0.40 0.11 ‐0.49 0.25**
Usefulness 0.35 0.91 0.17 0.61 0.11 0.72*
Satisfaction ‐0.22 0.40 ‐0.45 0.09* ‐0.44 0.15*
* p < 0.05; ** p < 0.01; *** p < 0.001
Table 8.17. Means for usefulness and satisfying subscales per type of message, for groups of
participants that differ on the number of disorders, on the number of manoeuvres they have
problems with, or on the number of manoeuvres they would like to be assisted with.
8.4.4. System evaluation
Most participants were positive about the audibility and comprehensibility
of the messages. Except for one participant, everyone was very well able to
hear the messages. Eighty‐five per cent of the participants indicated that the
messages were also easy to understand and that it was easy to act upon
them. This does not mean that they always did act upon them. Only 18% said
that they always followed the advice of the support system. Another 63%
frequently followed the system’s advice.
One of the reasons for not following the system’s advices may be that
participants did not always trust them. Thirty‐five per cent of the
participants trusted the advices only occasionally or never. Two participants
indicated that it depended on the type of messages; they always trusted
traffic rules, but never safe gaps to join or cross. As regards the timing of the
messages, participants’ opinions differed to a greater extent. Whereas 38% of
the participants considered the timing of the messages to be correct, 20%
found that messages came too soon, and 35% found that messages
(occasionally) came too late. This aspect of participants’ opinions about the
system was clearly related to functional age. Whereas 70% of the functionally
young participants considered the timing of the messages to be correct or
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