What is road tar made of?

Answer

Road tar is made from a mixture of hydrocarbons produced by processing crude oil or natural gas. Bitumen is the remnant of crude oil after the gasoline, kerosene, diesel oil and other fuels have been removed.

Bitumen is solid at low temperatures, but turns into a liquid at high temperatures. Tar is usually applied while hot so that it flows down into road cracks easily. Once cooled it turns into a semisolid substance. On days with a high ambient temperature tar becomes soft, and can become loose and pull away from the roads. This leads to the oil contained inside the tar being sprayed onto the lower panels of vehicles passing over them.

Q&A Related to "What is road tar made of?"
Roads aren't made of tar, you are thinking of asphalt or bitumen. These materials are relatively inexpensive and readily available. Asphalt often performs well when compared to alternatives
http://www.quora.com/Why-are-roads-made-of-tar
1. Pour 3 parts of baking soda and 1 part of water into a plastic container. Stir with a spoon to form a soft paste. 2. Dampen a soft, non-abrasive cloth under running water. Squeeze
http://www.ehow.com/how_6321837_road-tar-off-car.h...
John Loudon McAdam, a Scottish road building expert, is credited with being the first to build tar surfaced roads. That is why they are called macadam roads.
http://wiki.answers.com/Q/Who+invented+road+tar
Tar prevents the aggregate and bitumen mixture from cracking and seals out
http://www.chacha.com/question/what-is-the-reason-...
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