The four millionth Vauxhall Astra has rolled off the production line at the firm's Ellesmere Port factory.
Some 236 of the cars were used to spell out the figure to mark the achievement.
The Cheshire plant has been making the Astra since 1979.
Nearly 2,000 people are currently employed at the site, which produces around 680 Astras every day.
Vauxhall director of communications Denis Chick said: "The Vauxhall Astra has been one of Britain's best-selling and loved cars for almost four decades, and we're proud to manufacture it here in the UK at Ellesmere Port in Cheshire.
"We felt the production of our four millionth Astra was worth celebrating and, as always, the team at Ellesmere Port has stepped up to the challenge by creating this stunning image."
The Astra is the sixth most popular new car for UK motorists this year, with more than 34,000 registered between January and July.