In general, ISA system had positive effects, translated into a reduction in average speeds, between 0,9 and 8 km/h, in speed variance and speed violations. The size of these reductions depended on the type of ISA, with more limiting ISA types being more effective. There was no consensus about the areas where the effects on speed were greater.
When the ISA engagement was voluntary, the drivers tended to disengage it in lower speed limit zones, in part because in this context mutable variables were more common. In the short-term, the system was engaged about half of the time. In the long-term it was observed that there was an upward trend in overriding behaviour, at least until 3000km or three years of system exposure.
Other positive effects of ISA use were identified as well as collateral effects such as, compensation behaviour, diminished attention and over confidence.
Considering emotional state, the participants in the trials reported irritation and annoyance, mainly with mandatory systems. There was also an increase in safety perception.
No agreement was achieved in what concerns workload and travel time questions.
There are optimistic results on acceptance and acceptability of ISA, mainly of the advisory systems. Therefore, it seems that the higher the openness of the ISA, the higher the likelihood of being accepted by the drivers.
There is a great advantage in deploying ISA as the predicted decrease in injury accidents ranged between 10% and 36% and in fatal accidents between 18% and 59%. There is also evidence on the reduction of fuel consumption.
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