A road vehicle , comprising an automatic driving system , which is configured to drive the road vehicle using autonomous manoeuvres; the road vehicle further comprising: • an acceptability calculator , which is configured in order, at a given instant when the automatic driving system has planned to drive the road vehicle using a new autonomous manoeuvre, to determine an acceptability index of said new autonomous manoeuvre, as a function of manoeuvre intention data supplied to the acceptability calculator by the automatic driving system and reflecting the new autonomous manoeuvre; and • a warning device ; characterised in that : • the road vehicle further comprises an acceptability calculator , which is configured to determine, at said given instant, an acceptability index assigned to a person transported by the road vehicle , as a function of the acceptability index determined by the acceptability calculator and as a function of: ◆ a level of attention of the person at said given instant, determined by a monitoring module monitoring said person at said given instant and belonging to the road vehicle , and ◆ a level of involvement of the person in driving the road vehicle at said given instant; and • the warning device is configured to emit a signal to the attention of said person at said given instant, as a function of the value of the acceptability index, in particular only if the acceptability index reaches a trigger threshold. • an acceptability calculator , which is configured in order, at a given instant when the automatic driving system has planned to drive the road vehicle using a new autonomous manoeuvre, to determine an acceptability index of said new autonomous manoeuvre, as a function of manoeuvre intention data supplied to the acceptability calculator by the automatic driving system and reflecting the new autonomous manoeuvre; and • a warning device ; characterised in that : • the road vehicle further comprises an acceptability calculator , which is configured to determine, at said given instant, an acceptability index assigned to a person transported by the road vehicle , as a function of the acceptability index determined by the acceptability calculator and as a function of: ◆ a level of attention of the person at said given instant, determined by a monitoring module monitoring said person at said given instant and belonging to the road vehicle , and ◆ a level of involvement of the person in driving the road vehicle at said given instant; and • the warning device is configured to emit a signal to the attention of said person at said given instant, as a function of the value of the acceptability index, in particular only if the acceptability index reaches a trigger threshold. • the road vehicle further comprises an acceptability calculator , which is configured to determine, at said given instant, an acceptability index assigned to a person transported by the road vehicle , as a function of the acceptability index determined by the acceptability calculator and as a function of: ◆ a level of attention of the person at said given instant, determined by a monitoring module monitoring said person at said given instant and belonging to the road vehicle , and ◆ a level of involvement of the person in driving the road vehicle at said given instant; and ◆ a level of attention of the person at said given instant, determined by a monitoring module monitoring said person at said given instant and belonging to the road vehicle , and ◆ a level of involvement of the person in driving the road vehicle at said given instant; and • the warning device is configured to emit a signal to the attention of said person at said given instant, as a function of the value of the acceptability index, in particular only if the acceptability index reaches a trigger threshold. <EOS>