Britain should continue following EU car regulations to avoid extra costs for consumers, says the boss of Ford.
Some Brexit campaigners want the UK do more to set itself apart from the EU and to focus on markets beyond Europe.
Tim Slatter said: "It's really important that we maintain really good alignment to the European [regulatory environment] because that's where we build and sell most of our vehicles.
"Otherwise, what we're going to see is a lot of extra cost come into the cost of developing vehicles and producing vehicles and that can't be a good thing for customers."