Vertical alignment is accommodated through a classification scheme providing five different levels. Each classification is a function of the segment length and up- or downgrade percentage. The classification levels are based on reductions in heavy-vehicle FFS. On an upgrade, the speed reduction is a function of the effect of grade resistance limiting a vehicle’s acceleration capability. On a downgrade, the speed reduction is a result of trucks downshifting to avoid the potential of a “runaway” acceleration condition. Vertical Alignment Class 1 corresponds to a minimal reduction in FFS, while Vertical Alignment Class 5 corresponds to a crawl-speed condition.
Horizontal alignment is also accommodated through a classification scheme that considers reductions in heavy-vehicle FFS. The horizontal classifications are a function of curve radius and superelevation.
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