Last month, Brittany Ferries said she feared that 70,000 of the transport units she ships to the continent each year will be subjected to stringent and punitive checks on British goods that could be sent to Calais, warning them of possible job losses. And in July, Xavier Bertrand, the president of the French region Hauts-de-France, warned of the "economic catastrophe" in the event of a tough Brexit. There are fears of huge queues on motorways on both sides of the canal.
Barnier has not addressed the issue directly, simply by saying if Britain leaves the customs union and the single market "obstacles to trade in goods and services are inevitable".
But Jonathan Roberts, director of communications at the UK Dispatch Chamber, told Express.co.uk: "Since the EU sells us a lot more goods than we sell to them, Mr. Barnier would do well. to remember the importance of the path towards the Also the European side.
"We should remember, however, that there is a wide range of ports across the UK and in the EU that work hard to maintain the flow of trade.
"It is vital for them, as well as for Dover and Calais, that an agreement will soon be reached.
"If Dominic Raab did not know the importance of the crossing before he was sure he was doing it now.
"In total, 120 billion pounds of goods pass through Dover-Calais every year and it is a path of fundamental importance for the economies of both sides of the Channel".
Richard Ballantyne, Managing Director of the British Ports Association, said: "We welcome a better understanding by the government and the recognition of the potential impact of the new post-Brexit border controls on our sector.
"We have worked extensively with government officials and we are happy that the message seems to reach the ministers.
"While the Dover-Calais route is obviously very important, it is also worth mentioning that there are also other ports that handle significant levels of heavy trucks and vehicle trade with Europe, where new controls could cause major disruptions.
"These are ports like Holyhead, Hull, Immingham, Plymouth, Poole and Portsmouth, which facilitate regional and national trade levels.
"It will also be important for European leaders and EU negotiators to understand potential changes as these will also have an impact on their ports."
Mr. Raab made his surprising admission during a direct Q & A at a technology conference last night, during which he said: "We want a tailor-made agreement on goods that recognizes geographically unique economic identity, which is The UK.
"We are and, I did not fully understand this, but if you look at the United Kingdom and look at how we exchange goods, we are particularly dependent on the crossing of Dover-Calais".
Raab also mentioned why he defined "the peculiar geographical and economic entity that is the United Kingdom".
His comments have attracted the disdain of opposition politicians, said shadow minister Brexit Jenny Chapman, said: "How do we intend to trust this government to get a good deal for the country when we have a Brexit secretary who does not understand not even the basics of Brexit? "
Will Straw, executive director of the British campaign Stronger in Europe, tweeted that Mr. Raab should "do his homework before taking his leave".