This command enables a clothoid to be drawn independently. In other words, a clothoid which does not belong to any alignment and is not related to any road design element.
The following data may be entered in the dialog box:
X, Y Coordinates. Coordinates of the beginning of the curve. They may be entered numerically or graphically by clicking the < button.
Azimuth. Initial azimuth of the clothoid in hundredths of a degree. Its value may be typed into the relevant box or it may be designated graphically with the < button situated to its right.
Input Radius: Radius at the beginning of the curve (positive if it rotates clockwise, negative if it rotates counterclockwise). The value zero corresponds to an infinite radius.
Output Radius: Radius at the end of the curve. The sign should be the same as that of the entry radius. The value zero corresponds to an infinite radius.
Parameter: Value of the parameter A in the formula which defines the clothoid:
Length. Length developed by the clothoid in drawing units.
Azimuth Output: Azimuth at the end of the clothoid, in hundredths of a degree.
If the Input Radius, Output Radius, Parameter or Length fields are modified, the rest are recalculated automatically with the corresponding error controls.
The Apply button draws the desired curve with the current values without having to exit the dialog box. Once the OK button is clicked, the curve will be incorporated into the current drawing.
The Details button shows detailed information about all the curve’s geometrical parameters, as explained in this chapter’s introduction.
The Invert button changes the origin and the sign of the curve, so that the final point is interchanged with the initial point.
The Instruction Parameters button changes the clothoid’s parameter and length, assigning the minimum corresponding to the clothoid’s radius according to the highway instructions.
TcpMDT
