They didn’t have a GPS system back in those days.
it is an intensely practical document, more like a plan of the London Underground than a map.
“The red lines are the main roads. Every so often there is a little hook along the red lines which represents a rest stop – and the distance between hooks was one day’s travel.”
“Every so often there is a pictogram of a building to show you that there was a hotel or a spa where you could stay,” he said.
“It was meant for the civil servants of the late Roman Empire, for couriers and travellers,” he added.
