Infraworks 2018 has the capability to add parametric decorations (lamps, guard rails,…..) to component roads. The origin of the parametric models is Autodesk Inventor.
The video below explains the process of adding and using the parametric Inventor content to/in Infraworks. The focus of the video is on how to define the model so all the required information is exchanged correctly, rather than on the modeling capabilities of Inventor itself.
[youtube https://www.youtube.com/watch?v=jPnweqG26rw?feature=oembed]
Peter Ingels