Combined Curves. A crest curve with a grade at VPC (elevation 126.5 feet) of 2 percent is to be joined with sag curve with a VPT (elevation 111.5 feet) of +1 percent. Determine the distance between the curves' VPC and VPT if the common section between them is lo be at agrade of minus 2 percent. Adequate sight distance is lo apply at 55 mph.
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