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# 2.2.8.4 Creating a Tangent to a Curve

1. Click the Modify button () to activate the Modify function.

2. With the mouse pointer hovering over the endpoint of the object to be modified, Left+Drag (Section B.1) to change the length of the track segment.

If a Left+Drag is continued beyond the radius of a curved track (Section 2.1.2) (not a Circle) a tangent to the curve will be created.

Creation of the tangent begins when the distance from the curved track center to the cursor is greater than 110% of the radius. If the cursor is moved within the radius of the curve then the current command exits and the Changing Track Length (Section 2.2.8.3) command is executed instead.

If Easements (Section 2.10.4) are enabled then an easement curve will be generated (if required) to connect the old and new tracks.

For detail about;

  Changing track length refer to Section 2.2.8.3.

  Changing track radius refer to Section 2.2.8.5

  Extending track length refer to Section 2.2.8.6