It's the final day of talks to try to avert industrial action by workers who man the toll booths on the Severn Bridges
An overtime ban and work-to-rule is due to start at 5.55am on Tuesday while workers are set to stage a 24-hour strike on Friday 24 August - the start of the Bank Holiday weekend - in a dispute over changes to their shift patterns.
The Unite union said next week's action by around 70 of its members on the link between England and Wales could cause severe disruption to traffic.
Unite said it was still seeking to avoid the action and was holding talks with bridge operator Severn River Crossing. It says there's an obligation to keep the two bridges open, so one option could be to suspend tolls.
Regional officer Jeff Woods said: "Both Unite and the management are committed to finding a solution to the dispute."