Question

An
existing equal-tangent sag vertical curve is designed for 60 mi/h.
The initial grade is -3% and the elevation of the PVT is 754 ft.
The PVC of the curve is at station 134 + 16 and the PVI is at 137 +
32. An overpass is being constructed directly above the PVI. The
highway is for cars only (AASHTO minimum and recommended structure
clearances do not apply) and the overpass design assumes the
driver's eye height is set conservatively to 5 ft. What is the
lowest possible elevation of the bottom of the overpass structure
to ensure sufficient stopping sight distance at 60 mi/h

Answer #1

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An existing equal-tangent sag vertical curve is designed for 60
mi/h. The initial grade is -3% and the elevation of the PVT is 754
ft. The PVC of the curve is at station 134 + 16 and the PVI is at
137 + 32. An overpass is being constructed directly above the PVI.
The highway is for cars only (AASHTO minimum and recommended
structure clearances do not apply) and the overpass design assumes
the driver's eye height is set conservatively...

A 1,800 ft. long sag vertical curve (equal tangent) has PVC at
Station 145+10 and elevation 1,280 ft. The initial grade is -2.5%
and final grade is +4.8%. Determine the elevation and stationing of
PVI and PVT.

A 182.880m equal tangent sag curve has the PVC at station
5+181.600 and elevation 304.800m. The initial grade is -3.5% and
the final grade is 0.5%. Determine the stationing and elevation of
the PVT, PVI and the lowest point on the curve.

An equal tangent sag vertical curve is 600 ft long (i.e. 6
stations). The elevation of PVC is 1000 ft. The initial grade is
-0.035 ft/ft (-3.5%) and the final grade is +0.005 ft/ft (+0.5%).
What is the elevation of a point that is 350 ft (3.5 stations) from
PVC?
A) 1005.42 ft
B)991.83 ft
C) 991.01 ft
D) 996.83 ft

An equal-tangent crest vertical curve is being designed for a
speed of 55 mph. The curve connects grades of 2% and -3.5% in the
direction of interest. The curve high point is at station 110+00
and has an elevation of 500 ft. What is the station and elevation
of the PVC and the PVI?

) An equal-tangent crest vertical curve is designed for 100
km/h. The initial grade is +3.4% and the final grade is negative.
Draw the curve. What is the elevation difference between the PVC
and the high point of the curve?

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