(1) should make linear visually can naturally induce the driver's line of sight, and should maintain visual continuity.
(2) are combined with each design plane, profile and cross section limits should be avoided.
(3) flat, vertical surface alignment should correspond to each other, as well as continuous technical indicators size balanced with balancing the adjacent sections of the technical indicators, continuous.
(4) when the selection is limited conditions planes approaching each profile or maximum, minimum value, and combinations thereof, should be considered before and after the topography, and other technical indicators using the actual operating speed.
(5) Grade and Slope should be a combination of properly, and should be conducive to the road drainage and traffic safety.
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