No, a highway is man-made, therefore NOT natural.
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The correct answer is no, this is because builders, architects etc. People use there hands on this con structure.This is usually made of concrete.
There are a variety of types of natural boundaries. These natural boundaries include mountains, sea, lake, as well as deserts.
An ethnographic boundary is the dividing line between two ethnic groups. This can be a physical or a theoretical boundary.
Federal Highway Administration (FHWA)
interstate highway as u.. highway
building highway systems