Question

Coal Tar is used in road constructions. Why?

Answer 1

Asphalt may be confused with coal tar, which is a visually similar black, thermoplastic material produced by the destructive distillation of coal. During the early and mid-20th century, when town gas was produced, coal tar was a readily available byproduct and extensively used as the binder for road aggregates.

Answer 2

The coal tar was used on highways, pavements and the like as a binder for the aggregate. ... Due to this, partly, the use of coal tar dwindled and by the early/mid 1980s bitumen became the sole binder used for both macadam mixes and for surface dressing