Safety experts are urging the UK government to exclude American cars from any post-Brexit trade deal.
They say imported vehicles should meet British safety standards for accidents with pedestrians, cyclists and children.
UK PM Boris Johnson has indicated he expects cars to be included in any new transatlantic trade agreement.
But safety campaigners point to a spike of pedestrian injuries and deaths in US road accidents.
The increase is associated with a boom in large SUVs, which have been engineered to protect passengers but not pedestrians.
The UK government said safety standards would not be “diminished” as a result of talks.
US President Donald Trump has previously derided safety standards for pedestrians – although the White House later said he was joking.
A Ford Europe spokesperson said the firm had no intention of trying to bring vehicles into Europe that did not comply with regulations.
But Mr Cuerden said, from past experience, US negotiators would typically insist on equivalence of free access between markets. That meant cars could be used as a bargaining chip in the talks.
Mr Cuerden also warned that many of the UK’s crash barriers were designed to resist a car of standard weight and height. If British drivers started to buy large US-style SUVs in big numbers, the barriers might have to be replaced.
Big SUVs are the focus of concern among US experts, too. A study from the US Insurance Institute for Highway Safety (IIHS) said while the number of people killed in road crashes had fallen overall, the number of pedestrians killed by vehicles had risen by 53% over a decade.
Over the same period, the share of SUVs in the vehicle fleet rose to 29% from 21% – a trend replicated in the UK.
IIHS said design changes meant US SUVs no longer posed a greater threat to the occupants of other vehicles but there had not been a similar effort to address the danger that large SUVs posed to pedestrians.
Matt Blunt, president of the American Automotive Policy Council, which represents US carmakers, said cars made there were just as safe as European vehicles.
He told BBC News: “Cars, SUVs and other light trucks that meet US safety standards achieve equivalent safety performance to the safety standards applied in the European Union.
“A US-UK trade agreement should address the tariff and technical barriers to open US-UK automotive trade. This would increase competition and provide more consumer choice.”
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