The hidden engineering that prevents your commute from collapsing
In short: Most people see asphalt as a flat surface, but it is actually the top layer of a complex, multi-tiered structure. This video explains how engineers design these layers to manage weight and moisture.
Roads are engineered with multiple distinct layers—including the subgrade, subbase, base course, and pavement—rather than a single thick slab. This specific architecture is designed to distribute the heavy weight of vehicles across a wider area while preventing structural failure.
A primary focus of this engineering is water management, as moisture is considered one of the greatest threats to road integrity. The video explores how engineers select specific materials and determine varying thicknesses based on the unique requirements of different types of roads.
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Sources
- Summary by Intellect · source: Why Roads Are Built From the Ground Up
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