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Bitumen is a petroleum product that is made by distilling crude oil. Coal tar is a by-product of coke product from coal. Both are black in colour and have a similar appearance.
Although their characteristics are substantially different, both binders were used for pavement work. Tar is no longer utilised in paving because of its negative features, such as its high temperature sensitivity and the hazardous effects of its vapours during heating. Bitumen is a natural or pyrogenous gaseous, liquid, semisolid, or solid hydrocarbon material that is completely soluble in carbon disulphide and carbon tetra chloride.