An utterance about one general subject may be declarative or nondeclarative. The decisive point is what communicative function the sentence performs, not simply that a verb relating to travel occurs in it.
ExpressionClassification and reason
سَافَرَ مُحَمَّدٌReport: Muhammad travelled
عَلِيٌّ مُقِيمٌReport: Ali is resident
سَافِرْ يَا مُحَمَّدُInshāʾ: an instruction to travel
أَقِمْ يَا عَلِيُّInshāʾ: an instruction to stay
The imperative asks for an action, whereas the declarative forms assert a state or event.