caused by following a road.
This expression refers to the ability of crows to fly directly from A to B, without the encumbrances of roads and landscape features that restrict man.
Crows are perhaps an odd choice as, unlike many birds that migrate over long distances, their flight isn't especially straight. Crows normally fly in large wheeling arcs, looking for food.
With the price of fuel, we all need to travel as close as possible to 'as the crow flies.'
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