Overview
- The dataset and interactive map went live on November 6 in Scientific Data, offering public access to an empire‑wide road atlas.
- It traces 299,171 kilometers across 14,769 segments, nearly doubling the previous 188,555‑kilometer estimate by modeling routes that follow real terrain.
- The network is categorized into 34.6% main roads and 65.4% secondary roads, with major expansions in Iberia, Greece and North Africa.
- Uncertainty is quantified: roughly 2.7–3% of routes are precisely located, about 89–90% are less precise, and approximately 7–7.4% are hypothesized.
- Focused on around AD 150, the platform is positioned as an evolving resource, with plans to add river and sea links and to enable temporal analyses for research on connectivity, administration, migration and disease.