Macadam roads
Posted by John W on July 05, 1998 at 08:19:51:
In response to Some of us are doomed, written by Roger V on July 05, 1998 at 02:53:38
For an interesting reason. Th iron wheels of a wagon crushed and compacted the graded stones of which a Macadamised road was constructed. Rubber tyres create a vacuum under their tread and suck out the dust and fines which hold the surface together. The first solution was to spray the macadam toads with tar--hence Tarmacadam or Tarmac!
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