You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "At Pérignat there are still found remains of a Roman road and a necropolis with a sarcophagus and ceramic dated to the second century, Roman roads were physical infrastructure vital to the maintenance and development of the Roman state, and were built from about which year, through the expansion and consolidation of the Roman Republic and the Roman Empire?" whose answer is 300 BC.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when were roman roads built
Useful Output:

Doc 1: The first and most famous great Roman road was the Via Appia (or Appian Way). Constructed from 312 BCE and covering 196 km (132 Roman miles),
Doc 2: 16,000 km (10,000 miles) of Roman roads were built in Britain between AD43 and AD150. Before the invading Roman army arrived in AD43 there
Doc 3: The construction of roads was planned directly from Rome, as it was a matter of strategic importance. The most important ones were the paved ones.
Doc 4: Each road started out as a wide ditch and was gradually filled with a base layer of loose stones packed tightly together. Then a layer of logs
Doc 5: A brief explanation of the importance of Roman Roads and how they were originally made.  How the Roman Colosseum Was Built. Weird History