A child passenger in one of the cars was taken to hospital for checks
British TV presenter Ant McPartlin has been released under investigation after being arrested on suspicion of drink-driving on Sunday.
The 42-year-old is said to have been involved in a collision with two other cars while driving in west London, just before 4.00pm on Sunday.
A child passenger in one of the cars was taken to hospital for checks, as a precaution.
Others involved were treated at the scene for minor injuries.
McPartlin failed a roadside breath test and was arrested.
He had been with his mother at the time, according to The Sun.
A police spokesman said a 42-year-old man was taken to a south London police station for questioning and enquiries continue.
The 'Saturday Night Takeaway' presenter entered rehab last year after struggling with an addiction to painkillers.
In January, he announced he was divorcing wife and 'Strictly Come Dancing' make-up boss Lisa Armstrong after 11 years of marriage.