A council says it was not given any prior notice about a new weight limit which has been introduced on a major crossing between Wales and England.
Weight restrictions for heavy-goods vehicles will apply on the M48 Severn crossing from next month, in a bid to future-proof the 60-year-old suspension bridge.
But Monmouthshire council's chief executive said the authority was not warned of the rule change, which will see only heavy-goods vehicles up to 7.5 tonnes able to use the route between Chepstow and Aust, Bristol, from 27 May.
Councillors now want to meet the UK's transport secretary to discuss their concerns.
National Highways – which manages major roads in England – said it contacted stakeholders as soon as possible.
Paul Matthews, the chief executive of Monmouthshire County Council, complained on social media that to be notified of the decision, which was "quite a big deal" for the county, "would have been nice".
