Is melting of Tar for road construction a reversible change?

In India roads are made up of a black liquid which is prepared by melting a black material(probably coal tar). After cooling the liquid becomes very rigid. Can this solid be converted back to its previous liquid state by heating?


P.S: This is a question in my book. I think that after getting solidified the chemical composition of Tar may change so it can't be converted back to its original state.




Tar
 is mainly made up of a collection of very heavy hydrocarbons, with 
rather high melting temperatures. Commonly, it is mixed with some stones
 or gravel to make a harder surface for roads. It is possible to heat 
this up to soften or melt this; you can try it yourself by heating it in
 a metal can over a stove (don't use a container that you plan to keep 
clean) or in a wood or (char)coal fire.


EDIT: As MaxW pointed out, it would be a bad idea to do this inside the house because it would create a strong smell, similar to that created by whatever machine they used to make the road.


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The process is reversible, and can actually happen to some extent in hot weather, [see here](http://www.theatlantic.com/technology/archive/2012/07/wait-tarmac-can-melt/259565/) or [here](http://www.bbc.com/news/magazine-23315384). It can definitely soften on a hot day, and it melts at $150\rm~^\circ C$. 


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