A tangent section of highway has a -1.0% grade andends at station 0+145 and
elevation 26 m. It must be connected to another section of highwaythat has a -1.0% grade and that
begins at station 1 + 350 and elevation 40 m. The connectingalignment should consist of a sag
curve, constant grade section, and crest curve, and be designed fora speed of 80 km/h. What is the
lowest grade possible for the constant grade section that willcomplete the alignment?
