Its not so simple. Reinforcement, subbase, and other factors are used in the design of roads. https://archive.org/details/TheHandbookOfHighwayEngineering/Highw

Its not so simple. Reinforcement, subbase, and other factors are used in the design of roads. https://archive.org/details/TheHandbookOfHighwayEngineering/Highway_Engineering/page/n251/ https://archive.org/details/TheHandbookOfHighwayEngineering/...