A Treatise On Roads Their History Character And Utility Being the Substance
A Treatise On Roads Their History Character And Utility Being the Substance
S Dewitt Simeon Dewitt Bloodgood
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Where roads cross each other obliquely, or where one road abuts on another at an acute angle, turning in or crossing can only be conveniently performed in one direction. In laying out a road over a hill or mountain of angular figure and considerable height, much practical skill, as well as science, is requisite. In or- der to preserve a moderate inclination, or such a one as will admit of the descent of carriages without lock- ing the wheels, a much longer line will be required than the arc of ...the mountains. In reaching the sum- mit or the highest part to be passed over, the line must be extended by winding or zig-zaging it along the sides, so as never to exceed the maximum degree of steepness. This may occasion a very awkward appearance in a ground plan, but it is unavoidable in immense works. In laying out a road towards a river, stream, ravine, or any place requiring a bridge or embank- ment, an obvious advantage results from approaching them at right angles ; and the same will apply in re- gard to any part requiring tunnelling or crossing by an aqueduct, &c.
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