Nearly four million drivers are scheduled to travel on Monday, causing delays on many major routes, the RAC said. The roadside assistance company issued the warning as train and airline passengers faced long queues, while P&O Dover to Calais ferries remained suspended at the weekend. Use the Chrome browser for a more accessible video player 0:29 Long queues for the Eurostar in Paris Monday morning has already brought “nightmarish” queues for Eurostar customers at the Gare Du Nord in Paris following a failed IT border check that meant passengers could not board trains. Charlie Daffern, 36, a passenger from Cheltenham, said all trains were delayed by at least an hour. He said: “It’s a nightmare here. We’ve been queuing for check-in / security for over an hour and a half. Probably another hour to go. “People are getting very anxious and some people are panicking as they have flights to catch up with Heathrow this afternoon. I get it all with a little salt. The main problem is the lack of communication.” Loic Kreseski, 25, who lives in Hackney, said “hundreds and hundreds” were in line at the station. “I heard French border guards say they had never seen it. People are upset because of the delays and the fact that you have to stay still for hours. It is very upsetting when we know the price of the tickets. Image: Loic Kreseski shares picture of queues at Gare Du Nord train station in Paris “I would say that easily more than a thousand people line up at the Gare du Nord. (I’m) disappointed especially when we know ticket prices, lack of announcements and customer service.” Travelers using the EuroTunnel Le Shuttle service also reported “chaos” with long queues. Scheduled engineering on the UK rail network is also likely to mean more delays for travelers. Network Rail has completed 30 530 engineering projects totaling 83 83 million, which means the closure of the West Coast main line between London Euston and Milton Keynes for four days from Good Friday due to existing line upgrades and HS2 work. . Image: Passengers queuing to check in for the Eurostar International in St Pancras, London Sections of the railway between Birmingham International Station and Coventry have also been closed, along with the lines around Crewe Station. Passengers at Manchester and Gatwick airports also faced long queues. Lucie Spencer, 25, owner of a hair salon in Lancashire, said customers were experiencing “disappointing” and “annoying” delays as her flight was canceled for more than an hour due to apparent staff shortages. He said: “The queues were very long, we were at Terminal 2. They moved steadily but slowly. The mood at the airport was generally calm, but you could hear people moaning, of course, as it is not fun to stand in queues for so long. “Certainly due to a lack of staff, TUI basically did not have open ticket offices, but only self-checking, which seemed to cause a huge queue. Security was huge at the time as there were only three of the eight lanes open. “Queues to get into all the bars and restaurants, which means we had to give up so as not to miss our flight. “I was still sitting on the plane, I should have taken off at 8.30 am, but the luggage was not loaded on time on the plane.” Picture: Passengers waiting inside St Pancras in London TUI and Manchester Airport have been approached for comment. The suspension of Dover-Calais services by P&O Ferries has led to a lack of capacity on the main route and has contributed to long queues of trucks on the roads approaching the port of Dover in recent days. To add to the concern, petrol and diesel supplies at gas stations in some parts of the country are running at about half their normal level.