Make a 3D tube curve that is flatter/ovalized along it's tangent How can I make a tube that is flattened along it's tangent. For example, if the tube were folded, the two flat sides would be touching?

For example, in this image, where I extruded the curve and added depth, the curve is bending along the edge rather than bending along the flat side. I would like to extrude so the flat side is always aligned with the tangent of the curve at a given point.
You can adjust the tilt of each point to 'twist' the flat extrusion of the curve. The tilt property is visible in the Transform panel of the properties sidebar N or you can use &#9096; CtrlT within the 3DView