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In ancient times,a king had a boulder1placed on a roadway.Then he hid himself and watched the passers-by.He wondered if anyone would remove the huge rock.Some of the king’s wealthiest merchants and courtiers2came by and simply walked around it.Many loudly blamed the king for not keeping the roads clear,
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討論了提速線(xiàn)路改造工程中的線(xiàn)路平面參數(shù)問(wèn)題 :( 1 )最小曲線(xiàn)半徑 ;( 2 )緩和曲線(xiàn)長(zhǎng)度 ;( 3 )圓曲線(xiàn)和夾直線(xiàn)長(zhǎng)度 ;( 4 )采用反向曲線(xiàn)變更線(xiàn)間距可不設(shè)緩和曲線(xiàn)的最小圓曲線(xiàn)半徑 ;( 5)復(fù)曲線(xiàn)可不設(shè)中間緩和曲線(xiàn)的兩圓曲線(xiàn)最大曲率差 ;( 6 )超高 ;( 7)線(xiàn)間距。
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