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Aerobus Problems
Aerobus, however, was designed primarily as an urban "people mover," so it doesn't meet all our requirements for an interurban transportation system.
One problem is that the track is allowed to bow upwards between supports when there is no car running on it. This leads to significant vertical distortion of the track as the car passes; the rate at which this can be allowed to happen limits the permissible speed of the car. This problem can be solved by replacing the simple suspension system with a two-way cable truss (see Irvine, 1981) which essentially preloads the suspension system and keeps the track straight whether loaded or unloaded.
Another problem is curves: Aerobus uses a rigid rail for changes in direction. This is expensive structurally and economically and favors small-radius curves which impose speed limits and difficulties with the car's suspension. What is needed is a method of supporting gradual curves with cables alone, just like the straightaways, along with a track design that allows the cars to "bank" or lean into the curve - in other words, a track that is torsionally soft without sacrifice of tensile strength. This problem has not yet been solved, but is probably solvable and is under study.
http://opensourceecology.org/wiki/Aerial_Ropeways
You can list all the positives for it's use, but problems exist that have not been solved therefore, no one will use the system in any large scale as a reliable transportation option. Will this change in the future possibly, until then it's hasn't been proven to be a reliable or viable option.