The document discusses the historical development of road construction. It begins by covering the earliest roads dating back to 3500 BC in Mesopotamia and ancient India, which were primarily footpaths and bridle paths made of compacted earth. After the invention of the wheel, animal-drawn carts required harder road surfaces. The Romans are credited with developing the first major road networks between the 8th century BC and 4th century AD, building over 100,000 km of stone roads across Europe and Asia Minor with standardized designs involving gravel foundations, stone slabs, and bridges. The decline of the Roman Empire led to reduced road building in Europe until later periods.