Draw Line along surface

Hi,

I need to draw a line on a road surface that consists of 3D-Faces (yellow in the picture), so that the z-values follow the shape/profile of the road surface. The position (ie x and y values) of the line is given by an existing line with a z-value of 0 (blue line in picture). What is the easiest way to do this?

The wanted result can be seen with the red line in the background.

image

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