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State whether the following is true or false.
The straight-line distance between two points is a good estimate of the distance by road between them.

  • A.True
  • B.False
  • C.True only at large scales
  • D.False only at small scales

Answer: B

Roads bend around obstacles and follow gentler gradients, so the travelled distance commonly exceeds the direct one by a fifth or more. In broken country the difference can be much greater still, which is why a route is measured along its course rather than across it.

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