Traffic moves quickly and smoothly at the Hook of Holland ferry terminal on the western edge of Europe's biggest port.

A queue of trucks parked parallel to a giant white ferry rumbles forward and one-by-one the drivers make a sharp left turn onto a ramp that takes them up and into the belly of the ship bound for the English port of Harwich. Each truck takes just minutes to get on board, waved forward by a dock worker.

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Tomatoes are sitting in crates ready for transport as others hang from vines in the family-run Lans greenhouses in Maasdijk, Netherlands, Wednesday, Oct. 10, 2018. For years, the Dutch agriculture, horticulture and logistics industries have been refined so that if a supermarket in London suddenly wants more tomatoes it can get them from the greenhouse to the store shelf in a matter of hours. The seamless customs union and single market within the European Union have, for decades, eradicated customs checks and minimized waiting at borders. (AP PhotoPeter Dejong)

Traffic moves quickly and smoothly at the Hook of Holland ferry terminal on the western edge of Europe's biggest port.

View of the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018. Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

Gert Mulder of the Dutch Fresh Produce Center fears that the slick boarding procedures could be slowed to a crawl if negotiators fail to finalize terms of Britain's divorce from the EU and customs and food safety checks are introduced for exports heading across the North Sea to Britain.

Trucks make their way onto a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018.  Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if Brexit negotiators fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

"Fruit and vegetables are quite easy at the moment," Mulder says. "But if there's one truck that's not well documented, everything blocks."

Trucks ride up a ramp into the belly of a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018.  Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

Mark Dijk of the Port of Rotterdam says that many drivers who arrive without the correct papers should be able to straighten out the problem within minutes. But he added: "Two-to-five minutes ... where 400-800 trucks are being loaded within an hour can be a lot of time." Dijk says the port is looking for extra space to park trucks as the Brexit date looms.

Trucks wait to make their way onto a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018. Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

The government has set up an online Brexit counter and checklist for companies doing business with Britain, but a report this year warned that only 18 percent of Dutch companies were prepared. Some 35,000 Dutch companies that do business with Britain have no experience of dealing with countries outside the EU single market.

Trucks make their way onto a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018.  Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

If there is a hard Brexit, Van Berkum says, "everybody loses."

Tomatoes hang from vines in the family-run Lans greenhouses in Maasdijk, Netherlands, Wednesday, Oct. 10, 2018. For years, the Dutch agriculture, horticulture and logistics industries have been refined so that if a supermarket in London suddenly wants more tomatoes it can get them from the greenhouse to the store shelf in a matter of hours. The seamless customs union and single market within the European Union have, for decades, eradicated customs checks and minimized waiting at borders. (AP PhotoPeter Dejong)

From the greenhouse, the tomatoes are sent to traders who take orders and organize exports. From the Lans greenhouse in Maasdijk, it's only a 10-minute drive to Hook of Holland. The tomatoes wind up in stores and restaurants including British supermarkets.

Tomatoes hang from vines as a worker prunes plants in the family-run Lans greenhouses in Maasdijk, Netherlands, Wednesday, Oct. 10, 2018. For years, the Dutch agriculture, horticulture and logistics industries have been refined so that if a supermarket in London suddenly wants more tomatoes it can get them from the greenhouse to the store shelf in a matter of hours. The seamless customs union and single market within the European Union have, for decades, eradicated customs checks and minimized waiting at borders. (AP PhotoPeter Dejong)

The seamless customs union and single market within the European Union made it easy by eradicating customs checks and minimizing waiting at borders. That enabled producers of fresh produce like tomatoes and cucumbers to transport their products at the very last minute, cutting down on costly storage.

Tomatoes hang from vines in the family-run Lans greenhouses in Maasdijk, Netherlands, Wednesday, Oct. 10, 2018.  For years, the Dutch agriculture, horticulture and logistics industries have been refined so that if a supermarket in London suddenly wants more tomatoes it can get them from the greenhouse to the store shelf in a matter of hours. The seamless customs union and single market within the European Union have, for decades, eradicated customs checks and minimized waiting at borders. (AP PhotoPeter Dejong)

Tomatoes hang from vines in the family-run Lans greenhouses in Maasdijk, Netherlands, Wednesday, Oct. 10, 2018. For years, the Dutch agriculture, horticulture and logistics industries have been refined so that if a supermarket in London suddenly wants more tomatoes it can get them from the greenhouse to the store shelf in a matter of hours. The seamless customs union and single market within the European Union have, for decades, eradicated customs checks and minimized waiting at borders. (AP PhotoPeter Dejong)

Trucks make their way onto a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018.  Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

Trucks make their way onto a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018. Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

In the Netherlands, a major exporter to Britain and gateway to and from Europe through its ports, there are fears that freight will have a much longer wait come March 30, the day after Britain leaves the European Union.

Tomatoes are sitting in crates ready for transport as others hang from vines in the family-run Lans greenhouses in Maasdijk, Netherlands, Wednesday, Oct. 10, 2018. For years, the Dutch agriculture, horticulture and logistics industries have been refined so that if a supermarket in London suddenly wants more tomatoes it can get them from the greenhouse to the store shelf in a matter of hours. The seamless customs union and single market within the European Union have, for decades, eradicated customs checks and minimized waiting at borders. (AP PhotoPeter Dejong)

Tomatoes are sitting in crates ready for transport as others hang from vines in the family-run Lans greenhouses in Maasdijk, Netherlands, Wednesday, Oct. 10, 2018. For years, the Dutch agriculture, horticulture and logistics industries have been refined so that if a supermarket in London suddenly wants more tomatoes it can get them from the greenhouse to the store shelf in a matter of hours. The seamless customs union and single market within the European Union have, for decades, eradicated customs checks and minimized waiting at borders. (AP PhotoPeter Dejong)

Gert Mulder of the Dutch Fresh Produce Center fears that the slick boarding procedures could be slowed to a crawl if negotiators fail to finalize terms of Britain's divorce from the EU and customs and food safety checks are introduced for exports heading across the North Sea to Britain.

EU and British negotiators are in frantic talks to seal a deal on relations after Brexit day, with leaders meeting for a summit Wednesday and Thursday. If they fail, a so-called "hard Brexit" - with border controls and tariffs - comes a step closer.

Just one truck driver showing up at the docks without the proper paperwork and being forced to turn around in the cramped dockside "could throw it all into chaos," says Mulder, whose organization represents some 350 traders and growers' associations who export hundreds of millions of euros (dollars) worth of produce to Britain every year.

View of the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018. Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

View of the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018. Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

"Fruit and vegetables are quite easy at the moment," Mulder says. "But if there's one truck that's not well documented, everything blocks."

Mulder is not alone. British and Dutch authorities have warned that failure to reach a Brexit deal could lead to huge traffic jams approaching ports on both sides of the North Sea as truck drivers and customs officials adapt to Britain's life outside the EU's single market and customs union.

Roel van 't Veld, Brexit coordinator with the Netherlands Customs Authority, says that the number of completed forms drivers need to leave the EU and enter Britain could rise from one or two now to nine.

Trucks make their way onto a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018.  Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if Brexit negotiators fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

Trucks make their way onto a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018. Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if Brexit negotiators fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

Mark Dijk of the Port of Rotterdam says that many drivers who arrive without the correct papers should be able to straighten out the problem within minutes. But he added: "Two-to-five minutes ... where 400-800 trucks are being loaded within an hour can be a lot of time." Dijk says the port is looking for extra space to park trucks as the Brexit date looms.

Dutch ports handle shipments to Britain from the rest of the EU and further afield, and a report by the Netherlands Institute for Transport Policy Analysis estimates that cargo leaving the Port of Rotterdam could drop by 4.5 percent if there is no Brexit deal.

Dutch authorities say they are hoping for the best and preparing for the worst. The customs service is hiring some 900 new staff, the food and animal welfare authority is scouring southern and eastern Europe for qualified vets to carry out checks on live imports.

Trucks ride up a ramp into the belly of a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018.  Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

Trucks ride up a ramp into the belly of a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018. Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

The government has set up an online Brexit counter and checklist for companies doing business with Britain, but a report this year warned that only 18 percent of Dutch companies were prepared. Some 35,000 Dutch companies that do business with Britain have no experience of dealing with countries outside the EU single market.

There is plenty at stake for the Dutch, whose economy relies on exports and which has close links to Britain. A hard Brexit will not only mean delays at the border, but trade tariffs that would raise the price of European products.

"Exports will go down and that will translate into lower prices and lower production of Dutch agriculture," said Siemen van Berkum, an economist at Wageningen University who wrote a Dutch government-commissioned report on the possible economic fallout. "We estimate about 2 percent of the production value will be foregone and that means about 500 million euros on a yearly basis."

Trucks wait to make their way onto a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018. Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

Trucks wait to make their way onto a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018. Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

If there is a hard Brexit, Van Berkum says, "everybody loses."

Just a few miles from Hook of Holland, the family-run Lans tomato business is one of the Dutch companies whose products end up in British stores.

It is a model of efficiency. Staff use bicycles to get around a greenhouse the size of about 10 soccer fields, while automated carts tow trollies stacked high with boxes between carefully manicured rows of vines heavy with tomatoes ranging in color from bright red to light green.

Trucks make their way onto a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018.  Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

Trucks make their way onto a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018. Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

From the greenhouse, the tomatoes are sent to traders who take orders and organize exports. From the Lans greenhouse in Maasdijk, it's only a 10-minute drive to Hook of Holland. The tomatoes wind up in stores and restaurants including British supermarkets.

Wilko Wesse, a staffer at Lans, says the company's larger tomatoes are ideal for one of Britain's signature meals - the full English breakfast with its bacon, sausages, fried eggs, mushrooms and roasted or fried tomatoes.

For years, the Dutch agriculture, horticulture and logistics industries have been refined so that if a supermarket in London suddenly wants more tomatoes it can get them from the greenhouse to the store shelf in a matter of hours.

Tomatoes hang from vines in the family-run Lans greenhouses in Maasdijk, Netherlands, Wednesday, Oct. 10, 2018. For years, the Dutch agriculture, horticulture and logistics industries have been refined so that if a supermarket in London suddenly wants more tomatoes it can get them from the greenhouse to the store shelf in a matter of hours. The seamless customs union and single market within the European Union have, for decades, eradicated customs checks and minimized waiting at borders. (AP PhotoPeter Dejong)

Tomatoes hang from vines in the family-run Lans greenhouses in Maasdijk, Netherlands, Wednesday, Oct. 10, 2018. For years, the Dutch agriculture, horticulture and logistics industries have been refined so that if a supermarket in London suddenly wants more tomatoes it can get them from the greenhouse to the store shelf in a matter of hours. The seamless customs union and single market within the European Union have, for decades, eradicated customs checks and minimized waiting at borders. (AP PhotoPeter Dejong)

The seamless customs union and single market within the European Union made it easy by eradicating customs checks and minimizing waiting at borders. That enabled producers of fresh produce like tomatoes and cucumbers to transport their products at the very last minute, cutting down on costly storage.

Those days could soon be over if there is no Brexit deal.

"If there are a lot more checks, the time between harvest and laying in the supermarket will be longer and that is not good for your fresh product," says Wesse.

Tomatoes hang from vines as a worker prunes plants in the family-run Lans greenhouses in Maasdijk, Netherlands, Wednesday, Oct. 10, 2018. For years, the Dutch agriculture, horticulture and logistics industries have been refined so that if a supermarket in London suddenly wants more tomatoes it can get them from the greenhouse to the store shelf in a matter of hours. The seamless customs union and single market within the European Union have, for decades, eradicated customs checks and minimized waiting at borders. (AP PhotoPeter Dejong)

Tomatoes hang from vines as a worker prunes plants in the family-run Lans greenhouses in Maasdijk, Netherlands, Wednesday, Oct. 10, 2018. For years, the Dutch agriculture, horticulture and logistics industries have been refined so that if a supermarket in London suddenly wants more tomatoes it can get them from the greenhouse to the store shelf in a matter of hours. The seamless customs union and single market within the European Union have, for decades, eradicated customs checks and minimized waiting at borders. (AP PhotoPeter Dejong)

Tomatoes hang from vines in the family-run Lans greenhouses in Maasdijk, Netherlands, Wednesday, Oct. 10, 2018.  For years, the Dutch agriculture, horticulture and logistics industries have been refined so that if a supermarket in London suddenly wants more tomatoes it can get them from the greenhouse to the store shelf in a matter of hours. The seamless customs union and single market within the European Union have, for decades, eradicated customs checks and minimized waiting at borders. (AP PhotoPeter Dejong)

Tomatoes hang from vines in the family-run Lans greenhouses in Maasdijk, Netherlands, Wednesday, Oct. 10, 2018. For years, the Dutch agriculture, horticulture and logistics industries have been refined so that if a supermarket in London suddenly wants more tomatoes it can get them from the greenhouse to the store shelf in a matter of hours. The seamless customs union and single market within the European Union have, for decades, eradicated customs checks and minimized waiting at borders. (AP PhotoPeter Dejong)

Trucks make their way onto a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018.  Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)

Trucks make their way onto a ferry in Hook of Holland terminal in the harbor of Rotterdam, Netherlands, Tuesday, Sept. 11, 2018. Gert Mulder of the Dutch Fresh Produce Center that supports some 350 traders and growers associations fears the worst if negotiators trying to hammer out a Brexit deal fail. One truck driver showing up at the docks without the proper paperwork "could throw it all into chaos," he says. (AP PhotoPeter Dejong)