Assisting the older driver - SWOV

Assisting the older driver
participant drove off with the intention to pass the intersection (Acc_Pre).
The relevant vehicles (i.e., those having right of way) decelerated less during
the drives during which participants were supported, than during the drives
without driver support (see Table 8.9 for means and standard errors; F(1, 37)
= 5.493, p = 0.025, η 2 = 0.129). The same effect was found for the messages
RoW that told participants that they themselves were driving on a major road
(F(1, 37) = 4.299, p = 0.045, η 2 = 0.104). However, this effect only related to
those intersections at which participants, while driving on a major road,
turned left into a minor road. The other intersections at major roads were not
included in this particular analysis. Nevertheless, it is not quite clear why the
RoW‐messages would affect the safety of a decision to turn in front of an
approaching vehicle.
Messages regarding right of way for traffic approaching from the right (YtR)
affected the frequency of unsafe decisions (Acc_Crit). Unsafe decisions
occurred less frequently while being supported than while not being
supported (F(1, 37) = 9.437, p = 0.004, η 2 = 0.203).
Functional age did not affect the safety of decisions, neither as a main effect
nor as part of an interaction effect. For those messages that significantly
improved the safety of driver decisions, all functional age groups showed the
same trend.
Acc_Pre
(lower value = less safe decisions)
Acc_Crit
(higher value = fewer safe decisions)
Mean Standard error Mean Standard error
RoW
No support
Support
‐ 0.113
0.057*
0.056
0.042
0.224
0.183
0.030
0.026
YtR
No support
Support
‐ 0.457
‐ 0.331
0.066
0.081
0.331
0.227**
0.028
0.022
AMR
No support
Support
0.005
0.130*
0.042
0.033
0.108
0.100
0.018
0.018
* p < 0.05; ** p < 0.01
Table 8.9. Means for safety of driver decisions per priority regulation, without and with
driver support.
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