Horizontal alignment (Edit Spreadsheet)

1. Lane Cross-section

2. Start Point

- x : x-coordinate of the starting point.
- y : y-coordinate of the starting point.
- Direction : degree angle of the starting point

3. Input Spreadsheet 
The Input values consist of "Type of Curve", "Radius (Start)", "Radius (End)", "Length" , "Direction" and "Skip E".

- Type of Curve : Type of Curve is "Tangent", "Spiral", "Simple" and "Deflection"

- Radius (Start) : if Type of Curve is "Simple", the radius of simple curve. else if type of curve is "Spiral", it is the beginning radius of spiral curve. If empty or "0", it is infinitive radius.
- Radius (End) : the ending radius of spiral curve.
- Length (Deflection) : if Type of Curve isn’t Deflection, Length is curve length. if Deflection, Length is the angle of deflection.
- Direction : select the direction of curve (cw: clockwise, ccw :counterclockwise)
Skip E : the checked curves ignore superelevation.