I found this somewhere and thought its interesting to share it here:
Question : How does the ERP help relieve traffic congestion?
Answer : By discouraging people from entering congested areas controlled by ERP.
Question : When people are discouraged from going someplace because of ERP, how do they get to where they want to go?
Answer : By using public transport as a first choice!
With me so far? Well, everything works out fine because by taking public transport, road congestion is reduced which is the raison-d'etre for the ERP! Now l...
Question : When more people take public transport because of the ERP, what happens to the number of vehicles used for public transport?
Answer : They become over-crowded so the public transport companies have to spend more to cover the increasing demand.
Last two questions,
Question : When the public transport companies spend more, how do they get more money?
Answer : They raise the price for public transport!
Question : When the price of public transport goes up, how does it impact the ERP?
Answer : It makes the ERP less effective in curbing traffic congestion! So more people start driving again. When more people start driving again, the ERP goes up again. The people start taking public transport again ad infinitum.
There is another glitch here. When people go back to driving, the demand for public transport goes down INSPITE of the new investments coming in. This reduces income to the public transport companies compounding their need to increase prices!
Is what I am saying real? I definitely think so. At the macro economic level, many things can be predicted and in this case, a vicious cycle ASSURES Singaporeans of increases in public transportation costs and ERP charges for a long time to come.