* The Draw 3D model dialog didn't always open as expected - this is now fixed

* The lower surface of the pavement was not always drawn - this is now fixed

* The tunnel was not always drawn in 3D - this is now fixed

* The pavement cross fall was not always relative to the horizontal plane, but could be relative to the tunnel rotation plane when this option for the pavement was chosen by the user. This is now corrected so that the specified cross fall is always modeled relative to the horizontal plane.