End a tangential arc using the following point with the same code to define the exit tangent.
- A control code at the exit tangent point with the action 'Arc End (Tangential)'.
- A point following the exit tangent point with the same code.
Control Code Definition
A control code action 'Arc Start (Tangential)' is given a value 'STA'.
A control code action 'Arc End (Tangential)' is given a value 'ETA'.
Measured Points
The first point (pt 9) is assigned the code 'BCK' (Back of Kerb) and it defines the start of the entry tangent for the arc.
The second point (pt 10) is assigned the code 'BCK STA'.
The third point (pt 11) is assigned the code 'BCK ETA'.
The fourth point (pt 12) is assigned the code 'BCK' and it defines the end of the exit tangent.
- Creates a two dimensional circular arc.
- When an 'Arc End (Tangential)' control code action is encountered, the previous point in the same sequence should contain the 'Start Tangential Arc' control code action.
- All four points required to form the tangential arc, must have the same feature code.
