“…though corrected by the tiredness factor , explained before. Note that the factor being smaller than one must be used as a multiplying factor and cannot be used as a denominator to increase a failure probability because it can lead to values larger than one, that is, to an inconsistent model (see Castillo et al, ). On the other hand, some signals, depending on their state, require a given action from the driver, which, in case of being ignored, lead to a hazard or risk situation and possibly to an accident.…”