the curve/circle tool to locate the curve where two
construction lines intersect.
Next, use the curve tool for horizontal
curve design by clicking on the icon fro the toolbar. A
window allowing for curve radius input will pop up around the upper right corner
of the screen as shown in Figure 4(a).
Figure 4(a) Curve setting input
Figure 4(b) Check minimum curve
Enter the desired
radius, for example 1110 ft, of the curve before you click on the left mouse
over the contour map. A message, as shown in Figure 4(b) will pop up if it does
not meet the minimum radius requirement. Click on the left mouse and drag the
curve/circle to a relatively close location where the curve will be constructed.
Construct two curves as shown in Figure 5. Note: The curve/circle does not need
to be placed exactly tangent to the lines. A curve alignment tool will be discussed and
used in next section to automatically compute the tangent points and align the
curve with the lines.
Note: Use right mouse clicking on a segment (line or curve)
Figure Figure 5 Construct horizontal