Typical highway offers several layers beyond what we can see on the surface. It is and should be build the way it allows the traffic pass above without any problems and difficulties. There are several parts the highway always have and they should be installed on a way that is filling the norms for quality and strength. There are dimensions, numbers and standards that must be followed in order to be build a quality road. 
Typical Cross Section of a Regularly Build Highway
The images bellow will show you more details of the road construction in a way that you would understand it. Take a look!
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