Having a moderate toll will still reduce some discretionary trips. Right now, driving is cheaper than GO train. Even a 10 cent/km could change equation in favour of GO for a lot of commuters. If every highway is tolled, then the overall traffic on the roads will reduce. We may not have free flowing traffic throughout the day on 407 but we will reduce congestion on every single highway to some extent.The tolls should be sufficient to keep highways moving. I don't think cutting the 407 tolls so that it is gridlocked is a good idea.