I believe the system used on the M50 to toll motorists is a step backwards, using an arbitrary and inconvenient 8pm deadline, with no effective enforcement mechanism for non-irish reg cars (if it registers that they passed through - has happened that it has not) and charging not a small amount.
The only hi-tech thing about it is the video capturing of the car's reg.
Having read the thread via the link in Bond-007's post, it would appear that it'll require the widespread adoption of a similar video recognition for tolls throughout Europe, coupled to a change in the law at EU level before any proper enforcement can be carried out. The disruption to be created by protests over the job losses and video registration requirements with the closure of all those large-scale motorway tolling stations in France, Italy & Spain is only to be imagined.
Supposing that it is the way forward, some country would have to lead out on the adoption of such a system, but I think the way its been gone about here isn't very clever and still smacks of profiteering like the old tolling station, which was like the country's largest slot machine (one armed bandit style).