This is really great, but would love to see the road pieces in a standardized size so that they can be placed on a grid. This would help when placing them with either snap to grid enabled or, in my case, programmatically placing them.
For example, notice how the road end is slightly longer on the right side (looking downwards orthogonally), going to 8m, where as the road straight has a completely different dimension.
Still very happy with the models though :)