It's fantastic the work you have done, it's been a day that I break my head to make a very small map, but already the map it provides in demo I can not make new route because the publisher route does not set the static mesh.
When I create a field the editor works well but I never manage to see my bus on the ground.
look on the UE4 forum, I put a message with a photo.
www.passion3d.com Youtube: Meletou1