This paper proposes a fuzzy expert system for setting Brazilian highway speed limits. Therefore, under current Brazilian practice, the decision-maker is faced with a subject decision that mostly relies on expert judgment. For example, in Brazil, the standard guidelines list a series of factors that influence speed limits, but they do not provide a clear methodology to choose a speed limit for a highway segment. However, setting a speed limit generally involves selecting a base speed (e.g., operational speed, design speed) and adjusting it with several other variables. Speed limits should provide a balance between safety and traffic flow. The results indicate that V–ISA can have a positive impact on road safety by helping drivers to modulate their chosen driving speed. Our results suggested that V–ISA was effective in mitigating the risks associated with speeding, with relatively high acceptance and perceived usability levels. Furthermore, drivers were asked for feedback on the acceptance and usability of the three V-ISA. Thirty expert drivers experienced four simulated driving conditions, in which the three V–ISA variants together with the V-ISA off control condition were tested separately. Here, we assessed the impact of V-ISA variants on driver speed choice. Thus, the question of whether V-ISA modulates driving speed choice remains open. The effects of V-ISA on driving performance have yet to be investigated. ![]() The V-ISA operates in the following three ways: it can (i) display visual information, (ii) alert the driver with a warning sound, and/or (iii) intervene directly to modify and control vehicle speed. ![]() A recently developed ISA system, called V–ISA (Hazoor et al., 2021), is able to estimate the dynamic (real-time) speed limit, based on the prevailing sight conditions and stopping distance. Intelligent Speed Adaptation (ISA) systems might help the driver to make safe speed decisions along road sections with limited visibility. Travelling at excessive speed increases the risk of having a road crash.
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