Driver behavioural effects from ISA

Författare

Andras Varhelyi
Emeli Adell
Arno Rook
Jeroen Hogema
Steven Broekx
Luc Int Panis

Summary, in English

Activities with the aim to assess the effects of ISA on driver behaviour through experimental research were carried out. In order to investigate the regional differences in effects on driver behaviour when driving with ISA field trials were set up in Hungary and Spain. Complementary results were added from the Belgian ISA field trials. To investigate the effects on driver behaviour from different kinds of ISA (informative/limiting), experiments were carried out in a driving simulator. The experiments on the effects of various ISA systems have shown that all systems had an effect on speed. The largest effects were found on the highest speeds. Speed variance also decreased. Besides these, from the safety point of view positive effects on speeds, the simulator experiments showed that no signs of compensatory behaviour or complacency were found for the studied systems. The effect was greater for the AAP than for the BEEP system. The dead throttle is more effective in reducing speed than the high-force pedal and the low-force pedal is least effective. The tactile (vibrating) gas pedal is somewhere between the high-force pedal and the low force pedal. Both the Hungarian and the Spanish participants of the field trials seem to have a positive attitude towards ISA in general. However the attitudes to the two systems tested were more differentiated and got less positive after one month’s usage. Both systems were perceived as useful and neither satisfying nor dissatisfying. Hungarian drivers seem to be more skeptical to the systems than the Spanish drivers. However, there are no clear differences between the countries when looking at the acceptance, where the only relatively clear difference is that the Hungarian drivers like the AAP less than the BEEP system. The participants in the simulator studies had a more negative attitude towards the high-force pedal than they had towards low-force pedal, and a slightly more negative attitude towards the dead throttle than towards the tactile pedal. A trade-off situation between effectiveness and acceptance occurs: the informative system with some positive effect on driving behaviour and high acceptance or a more compelling ISA, with a more positive effect on driving behaviour, but less accepted.

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