Pen y Gyrn Roman Road section comprises earthwork remains of raised embankment with roadside ditches (agger) and a section of terrace road climbing a hillside. These sections of earthwork demonstrate two types of Roman engineering techniques used to construct roads.
The scheduled section measures 1200 meters long NW-SE, with sections of the agger up to 4 meters wide. The North end is located at SH8915229486 and the South end is located at SH8975328467.
Source: Cadw Scheduling description of June 2011