The AA went to its 100 millionth rescue when it came to the aid of a Renault Clio owner whose car failed to start.
Andy McMorran presented motorist Crystal Walter with a badge
The landmark rescue involved recruitment consultant Crystal Walter, 25, from Earl's Court in west London.
Ms Walter, whose vehicle was suffering from a loose battery connection, said it was great to be "part of history", and received a commemorative badge.
The motoring organisation, which was founded in 1905, is called out about 3.5 million times a year.
Scott Illman, the patrolman involved in the historic job, said: "After about 10 minutes the manager in the ops centre phoned me to say that I was about to attend the 100 millionth breakdown.
"I couldn't believe my luck. It is amazing to be involved in such a key part of the AA's history."
The AA reached the landmark of about 5.1 million rescues by the start of World War I, and the figure stood at about 82 million at the end of the 20th century.
It says the main problems plaguing motorists are the same as they were more than a century ago - running out of petrol or water, flat tyres, flat batteries and lost keys.