Pointless. What you didn't mention about cable elevator is that they have a counterweight. This balances the weight of the elevator meaning that the energy required to run it is only as much as the load in the elevator plus friction. <br>The reason we don't have elevators that go in multiple directions is that that's very inefficient and most tall building are not that wide and mose wide buildings are not that tall. <br>This system has no benefits over current systems and also no specific need.