(Bloomberg) — On the day the U.K. makes its final break with the European Union, the ports are clear of truck backups, goods are moving smoothly and grocery-store shelves are well stocked.

Even so, U.K. businesses that rely on some 1.2 billion pounds ($1.6 billion) worth of products crossing the border each day are taking no chances. At 11 p.m. Thursday, Brexit gets real.

Companies were already stockpiling and exploring alternatives to the crowded truck-ferry route across the English Channel when France unexpectedly closed its border for two days last week, citing a fast-moving Covid-19 outbreak in the U.K. The disruption produced miles-long backups at the Port of Dover — a warning shot for potential chaos as the Brexit transition period ends.

In response, logistics firms have redoubled efforts to relieve pressure on truck traffic, stepping up air freight, container ferry and air-cargo shipments. With the New Year arriving on a long weekend, concerns of an immediate repeat of last week’s spectacle have diminished. The port and its users will have the chance to ease into the new reality of a customs regime at the formerly open border.

“It should be quiet for at least the first few days,” said Richard Ballantyne, who heads the British Ports Association. “If there are blips of people turning up without the correct documentation, if it’s going to happen at any time, it’s better to be then.”

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Dover remains the U.K.’s most important link with the EU, the country’s biggest trade partner. Still, the amount of tonnage has declined steadily since the year of the Brexit vote — down 14% from 2016 to 2019, Department for Transport data show. Other ports have meanwhile gained business: Liverpool’s traffic grew 7.6% and London Medway surged 43%.

Avoiding Dover

The unanswered question is what happens in the coming weeks and months. With Britain’s departure from the single market come a host of regulations and customs paperwork that threaten to gum up the free flow of trade and add costs for importers and exporters on both sides of the split.

The trend toward other ports and unaccompanied freight moving by train or ferry, along with supplemental air-cargo shipments of vital goods, is expected to continue into the new year, according to port officials and logistics firms.

Container volumes traveling between the port of Tilbury, on the River Thames east of London, and Zeebrugge, Belgium, have increased by a fifth in December as firms sought alternatives to the short straits. P&O Ferries Ltd. has added an additional ship to the route to cope with demand.

Charles Hammond, chief executive officer of Tilbury owner Forth Ports Ltd., credits the coronavirus pandemic with changing the logistics industry’s dynamics. Unaccompanied freight is “the answer to a number of the questions of our time,” he said.

Container Ferries

Kuehne + Nagel International AG, one of Europe’s biggest freight-forwarding firms, has switched some goods from trucks to container ferries. It drops off and picks up the goods by truck on either side, something some smaller firms aren’t able to do.

The company is still moving goods across the English Channel via roll-on roll-off truck ferries, after implementing software that’ll make it easier to clear customs. The amount of paperwork has increased five-fold because of the new procedures, Kuehne + Nagel spokesman Dominique Nadelhofer said.

Firms that rely on frictionless movement of parts are opting to maintain their stockpiles for now.

Jet-engine maker Rolls-Royce Holdings Plc is holding onto 100 million pounds worth of additional inventory as it monitors the flow of goods over coming weeks, according to a spokesman. It’s not clear when it’ll return to normal levels.

Grocery Route

Products that can’t be stockpiled for long remain a concern, with aircraft being called in to clear up the remnants of last week’s shutdown. The cargo unit of Deutsche Lufthansa AG will fly another Boeing Co. 777F full of urgently needed goods — fruit, vegetables, clothing, oil-field equipment, medical equipment and jet-engine parts — from Frankfurt to Doncaster Sheffield Airport in England on Thursday.

That will be followed by a 100-tonne load of fruit and vegetables on Jan. 2 meant for supermarkets such as J Sainsbury Plc, Tesco Plc, Co-op Food and Aldi Stores Ltd.

Lufthansa Cargo is exploring ways to send freight from France to Ireland via ferry instead of trucking it through the U.K., which “currently makes little sense,” spokeswoman Jacqueline Casini said.

A potential shortage of truckers is a lingering concern from last week’s disruption, which stranded fresh seafood in trucks headed for Europe and sent fish prices haywire. Some drivers may “wait and see” before returning to the U.K. and others will demand more money, said Shane Brennan, CEO of the Cold Chain Federation, which represents movers of frozen and chilled goods.

The U.K. government on Wednesday extended an trade-credit insurance program that protects sellers against non-payment, a measure that will provide added support to the supply chain.

The acid test for British infrastructure will come next week, when traffic returns to normal levels, said Jimmy Buchan, Chief Executive Officer of the Scottish Seafood Association. “At that point buyers will be buying to export and replenish empty shelves,” he said. “Demand will be quite high.”

Ireland, which relies on truck traffic from the U.K. and through it from continental Europe, has hired 1,500 extra staff to deal with issues like tax and customs, as well as animal checks.

Irish officials warned of potential significant disruption to come as Brexit becomes reality. At a briefing on Wednesday, officials said little disruption is expected before next week, as many retailers had stockpiled supplies, but delays may take hold from there.

At Rotterdam, officials have set aside triple the parking area the port expects to need in case too many trucks show up with the wrong paperwork. Ninety percent of ferry users have signed up to its digital system, they said.

Despite the planning, some disruption is inevitable, said Tim Morris, CEO of the U.K. Major Ports Group.

“The ports and shipping companies are as prepared as they can be,” Morris said. “Outside of our control is how prepared British businesses are and how pragmatic European nations will be about border arrangements.”

©2020 Bloomberg L.P.