Bosses at ferry operator, Stena Line, have slammed the lack of investment in the roads to and from its port at Cairnryan in Dumfries and Galloway.
They say without major improvements, travel to and from the UK's third largest port will damage the economy.
They claimed that events over the weekend, which saw the A77 close for almost 24 hours due to severe flooding, will reoccur in the future if the current lack of investment in road improvements continues.
The road closure on Saturday caused major disruption in the area for freight and tourism traffic using the ports.
A Transport Scotland spokesman said: