> How is induced demand for the tunnel going to cause delays inside it then? There's no free lunch in dynamic systems. As I noted: > Better traffic flow in on

> How is induced demand for the tunnel going to cause delays inside it then? There's no free lunch in dynamic systems. As I noted: > Better traffic flow in one area creates incentives to drive in that area, creates incentives to live outside the range of public transport and so on. If the tunnel gets faster, more people will pile up behind the clever traffic lights you propose. Net travel time between home and work will come out the same, or worse, depending on the exact paths in play. Reducing driving by making it more attractive to drive hasn't proved out as a strategy. The only way to reduce traffic and keep it reduced is to make it less attractive to drive.