Roads are made from asphalt and not concrete because asphalt is cheaper to install and maintain. The time needed to install asphalt is considerably less than concrete. Asphalt roads provide a safer driving surface with more grip as well.
Asphalt Road Construction Process
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Do Roads Have Rebar Built Into Them? - BuilderSpace
Asphalt Vs. Concrete Road Construction - American Paving
Asphalt Road Construction : Turning An Earth Surface to Asphalt Road (Premix) Pavement Installation
Should asphalt pavements be replaced by concrete pavements? If yes, why? - Quora
Why are roads made out of asphalt and not out of other materials? - Quora
Concrete pavement preservation makes Oklahoma's turnpikes smooth, safe, and affordable without reconstruction
The Process of Paving Roads Explained - BuilderSpace