Fortifying and expanding the Roman Empire: As Rome increased its territorial dominance, a structured roadway system greatly enabled the quick transfer of armies into newly taken over areas to further secure these frontiers, ensuring control over conquered lands from enemies and rebellious communities.
Effective logistic networks: Maintaining supply lines in military campaigns is imperative in order to deliver provisions to troops. This became much more efficient for the massive Roman forces due to constructed roads like the Via Appia.