A motorist was knifed in the 16th Arrondissement of Paris on Monday after beeping his horn at a fellow driver at a red light.
The violent confrontation took place on Rue Daumier just before 6pm.
A police source told AFP that the victim became impatient whilst waiting at a red light at honked his horn at the driver in front.
The other driver took offence and got out of the car to confront him and “at this point the situation degenerated”, the source said.
“The victim was stabbed with a knife four times, to the face, the abdomen and the knee,” the source said.
He was rushed to a nearby hospital where his condition has been described as “critical”.
His attacker tried to flee the scene but was arrested a short while later near his home, French TV TF1 reported.
Police were able to track him down thanks to the registration number on the car.