Where I live toll roads are very common and even when travelling in a taxi the passenger has to pay the toll. When approaching a toll area the traffic is horrendous as most ordinary people try to get off on to the other roads and so nothing moves. The tolls are about £1 which is a lot for an average Thai worker.
The problem is that even the tolls roads are so crowded that you are actually paying for nothing as you can sometimes travel quicker on the ordinary roads. You tend to get angry when you have paid your toll and just sit there for 30 minutes not moving but there is no refund and basically it is money going to private investors for no benefit. After 10pm the system works just fine but tends to be a bit of a racetrack.