Distance Based ERP?

In concrete Singapore, motorists are charged for using roads leading to congested areas. Gantry points call the Electronic Road Pricing is widely used and charged at different rates to deter motorists coming into the restricted district by taking other routes and paying a reduced rate for the lesser used gantries.

But recently many Singaporeans have insisted that these gantries do not work and instead had created more jams as motorists reaching the gantry slow down and reaching a bottle neck instead.

The latest news about Singapore's ERP is now being considered to charge motorists based on distance, using a GPS technology. Wonder how it will turn out as this is still being worked on by LTA (Land Transport Authority) and being tested for the past couple of years.

Hopefully a fair enough system is borned.