While using Roadmaps we have realized once you define a View on a specific Roadmap, then the view is not available to use on the other Roadmaps.
So you need to define the view for every single Roadmap you create.
Release : 15.9.2
Component : Clarity Roadmaps
This is working as design.
This is a limitation at the moment.
We are planning to share views in roadmaps and hierarchies in some future release.
This is the same as for hiearchies:
Saved view not available across other hierarchies