This case study of rapid transit in the Molonglo Valley shows that corridors for vehicular traffic and light rail may have something in common, but public transit corridors are poorly suited for a cycle highway (transit). Cycle networks are different.
Bicycles are arguably the most efficient machine ever invented, however, everything has its limits. A 30m section of steep path is all that is required to bring a cyclist to a stop. Pushing a bike up steep paths is not popular amongst cyclists. Better is to build the paths so that they are never so steep to become unrideable. Austroads Standards tell us how. Hilly terrain requires careful route and path design.
So much money is spent on roads. Here is a comparison of the investment in road improvement (duplications and widening) with other forms of transport. As cyclists, we are interested in bike paths, but the light rail is included, too.