Question
What did the Romans invent that they covered the top of their roads in?
Steel
Concrete
Gravel
Steel
Concrete
Gravel
Answers
GPT-5 mini
Concrete.
The Romans developed opus caementicium (Roman concrete) and used layered road construction, often with a concrete base or binding layer beneath a paved or gravel surface. They did not invent steel or gravel.
The Romans developed opus caementicium (Roman concrete) and used layered road construction, often with a concrete base or binding layer beneath a paved or gravel surface. They did not invent steel or gravel.