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
Colombian drug lord Daniel Barrera Barrera was fined $10m for manufacturing hundreds of tonnes of cocaine that he trafficked globally.
The 37-year-old Somali immigrant to Canada died after being beaten by several police officers, according to local media reports.
This evening it'll become largely dry across the UK as the showers in the west gradually die down.