I'm making paving, quite successfully, but I'm having a bit of a problem making the slabs actually always come to the edges.
Generally the railclone works, using a surface and a cropping spline, and looks like this:
bus as you can see below, at the trailing edge (end of the array) on the offset slabs, it misses off the slab instead of cutting it.
Below, 1) is the surface that is used, 2) is the clipping spline that is used, and the circled areas are where I need to get a part slab to appear. It is only a problem where there is less than a half slab... which is annoying!