For at nå frem til dette mål kræves det, at de to opgaver er forenelige, hvilket vil sige, at systemets opmærksomhedskrav ikke bevirker, at den resterende ressource ikke rækker til at varetage kørslen forsvarligt.
Reaching this goal requires compatibility between the two tasks and this means that the attentional demand of the system does not cause the available resource to be less than that required to attend properly to the prevailing driving task.