We have seen with the M6 Toll that drivers can be turned off by the imposition of charges. There is already a toll to get into Wales on the Severn Crossing but no toll to get out.
There is no doubt that the M4 around Newport needs improving. At the moment if there is a bad accident and the road is closed there is no real alternative for drivers.
But if the road is tolled it reduced its economic effectiveness as a lot of people will be put off using it and will simply avoid it.
More top news
The Boeing 777 was reportedly intercepted by two Hungarian Air Force Gripens after it lost contact with air traffic controllers.
Culture Secretary is mulling over a bar on the broadcaster going head-to-head with commercial rivals as part of the review of its charter.
EastEnders stalwart Dame Barbara, 78, is leaving the soap and her final episodes as Peggy Mitchell will be shown in just over a week.