The layout line is used to define horizontal and vertical bridge alignment.
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FAQ
For curve definition, both radius and end bearing need to be entered. What type of curve is being defined by this?
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Answer: An arc of specified constant specified is centered within the specified station range. If this arc length is less than the difference in stations, transitions are created of where the curvature varies linearly from 1/R at each end of the arc to zero at the corresponding station end point.