To Create Curve Connections Using Tangent Constraints
1. Click 
Style > 
Curve Edit. The Curve Edit tab opens.
Style > Curve Edit. The Curve Edit tab opens.2. Select a curve and click its endpoint to display the tangent vector.
3. Perform one of the following operations:
◦ Right-click the tangent vector and choose a tangent constraint from the shortcut menu
◦ Click the Tangent tab. Under Constraints, select a primary tangent constraint from the First box.
4. On the Tangent tab under Properties, select Fix Length or Relax Length.
 | By definition, a Natural tangent has a relaxed length. |
5. Type values for the tangent attributes.
| | • You can specify elevation only for Free curves. When changing constraints, use the horizontal or vertical axis of the datum plane. • If the value of the tangent elevation angle is 90 degrees, modifying the tangent angle has no effect on direction. The elevation controls the tangent direction. • A draft measurement is available when you apply a Draft Tangent. |
6. Click 
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