Why did ancient Romans build roads?

Answer 1

That last comment is rubish :\

Answer 2

the first layer was compacted sand. then they placed on top of that: crushed rock

then on top of that was cement and gravel

on top of that was cement and sand

on the last layer was paving slabs which are like rocks :)

hope that helps

roads were also used so that an army could have a rapid transit.