I been making this procedural road tool for little while, the goal is to make a tools that artist can create roads on-fly in Houdini, also make it as procedural as possible and easy to use.
Tool features right now:
Module base road intersection.
Curve base road creation for high flexibility
Automatically placing different modules and route shape correction.
Auto adaption between road and terrain to make it look believable.
Procedural module and shape control
Route shape control custom attributes
I already tried out some workflow with Houdini Engine Unity, with some scripting it work pretty good. Still work in progress, going to proceduralize module texturing and some other things
vyudin What is can be very useful for Unreal side - if you could interact with Landscape in UE4.
I did had some implementation in unity with houdini engine, but that will be a lot the work to do on engine side. The tool is already design in object base, it mean all the result are separate in different object node, will be very helpful fit into the houdini engine.