@unknownuser said:
I've had some luck using Shapebender for this. It won't handle superelevation, but theoretically will handle a single cross-section. One problem with this method that I've not been able to solve is how to handle intersecting cross-streets.
Vali Architect's Instant Road maybe starts to do more of what you desire (although I think it uses a terrain surface, not a centerline profile to generate the elevations).
Shapebender did exactly what i want to create a cheap and nasty road alignment suitable for driveways/subdivisions.
Cheers!