Kant argued that morality presupposes this autonomy () in moral agents, since moral requirements are expressed in categorical imperatives. An imperative is categorical if it issues a valid command independent of personal desires or interests that would provide a reason for obeying the command. It is hypothetical if the validity of its command, if the reason why one can be expected to obey it, is the fact that one desires or is interested in something further that obedience to the command would entail. "Don't speed on the freeway if you don't want to be stopped by the police" is a hypothetical imperative. "It is wrong to break the law, so don't speed on the freeway" is a categorical imperative. The hypothetical command not to speed on the freeway is not valid for you if you do not care whether you are stopped by the police. The categorical command is valid for you either way. Autonomous moral agents can be expected to obey the command of a categorical imperative even if they lack a personal desire or interest in doing so. It remains an open question whether they will, however.