The Roman road from Trier to Cologne is part of the Via Agrippa, a Roman era long distance road network, that began at Lyon. The section from Augusta Treverorum (Trier) to the CCAA (Cologne), the capital of the Roman province of Germania Inferior, had a length of 66 Roman leagues (= 147 km).^[1] It is described in the Itinerarium Antonini, the itinerarium by Emperor Caracalla (198–217), which was revised in the 3rd century, and portrayed in the Tabula Peutingeriana or Peutinger Table, the Roman map of the world discovered in the 16th century, which shows the Roman road network of the 4th century.^[2]

The route of the Roman road is described in the Itinerarium Antonini as passing through seven stations, whose distance is given in leagues.
1 Gallic league corresponds to 1.5 milia passum = ca. 2,200 metres, where 1 milia passum = 1,000 passus = ca. 1,480 metres^[3]

The later Peutinger Table describes the same places with the exception of Tolbiacum (Zülpich) and Belgica (Billig), but without the addition of the word vicus. However, the entries about the route vary considerably from those of the Antonine itinerary and are often interpreted as transcription errors.^[4]

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Recent research and archaeological surveys of a corridor up to 250 metres wide along the road have shown that at intervals of no more than every three or four kilometres, and in densely populated areas often as little as a few hundred metres, there were sites of various vici (settlements), mansiones (inns) and mutationes, (coaching inns), stationes beneficiarium (military road posts) and religious votive stones, immediately by the road. This is especially true of crossroads, road junctions and river crossings. This road infrastructure was encouraged by the cursus publicus, a sort of national postal system.^[6]