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New Study Redraws Map of Roman Roads, Upending Long-Held Myths
By Drooid · · How we work
Core Findings: A Continental-Scale Road Network Re-examined
A multinational team led by Tom Brughmans of Aarhus University used the digital atlas Itiner-e to analyse almost 300,000 km (?186,000 mi) of Roman roads as they existed around AD 150. Published in *Nature Communications* on September 15, the study challenges three assumptions: Rome as the network’s hub, uniform straightness, and the persistence of many ancient routes in modern corridors. Provincial capitals such as Ankara, London and Corinth emerge as major crossroads, while Constantinople (modern Istanbul) ranks as the most central overland node, surpassing Rome. Straightness varies with terrain; low-land routes in western Europe and North Africa are relatively straight, whereas mountainous sections are less linear than contemporary highways.
Background & Context
The Itiner-e project, released last year as the largest map of the Roman road system, compiled archaeological records, historical documents, topographic maps and satellite imagery. Prior scholarship relied on fragmented qualitative evidence, often reinforcing the proverb “all roads lead to Rome.” Brughmans’ team applied network-centrality metrics and slope-gradient analysis to test these ideas at an empire-wide scale.
Data & Statistics
- Total mapped length: ?300,000 km (?186,000 mi).
- About 90 % of roads were built with a slope gradient suitable for animal-drawn carts, even across the Alps.
- Straightness correlates with topography: flat regions (e.g., Belgium, northern France, the Po Valley) show higher linearity; mountainous zones in southeastern Europe score lowest.
- Modern highways display a moderate overall correlation with the ancient network, but the strength varies widely by region.
- Provincial capitals consistently rank high in network centrality; Rome’s centrality is limited to the Tyrrhenian coast and the Italian peninsula’s Adriatic side.
Why It Matters
The findings revise our view of how the empire moved people, goods, pathogens and ideas. Demonstrating a flexible, landscape-responsive infrastructure rather than a rigid, Rome-centric grid highlights the role of provincial administration and trade in sustaining a capital of roughly one million inhabitants. The documented link between ancient routes and some modern corridors suggests that decisions made two millennia ago continue to shape European geography.
Official Statements & Responses
He noted that the network’s adaptability to local terrain was a deliberate engineering choice, allowing reliable overland travel even in challenging environments. Adam Pazout, lead author, stressed that the dataset remains incomplete; gaps in archaeological and documentary evidence mean the reconstruction reflects the best-available but not exhaustive picture of the empire’s roads.
Conflicting Reports & Gaps
The authors acknowledge that the underlying road network is a reconstruction based on uneven archaeological coverage. Regions with sparse evidence introduce uncertainty, and the analysis explicitly incorporates this variability rather than treating the map as a complete record. Consequently, some local continuities or divergences between ancient and modern routes may remain undocumented.