The car was following the leading group of five riders 38km from the finish when it swerved across the road to avoid a protruding tree.
Unfortunately, it managed to knock down Juan Antonio Flecha, who was riding beside the vehicle. Flecha hit Johnny Hoogerland, who was riding beside him - and sent him into a barbed wire fence.
"They caused the crash of both riders. This behavior is intolerable," Tour de France director Christian Prudhomme told the BBC.
Full of bruises and blood, Hoogerland was just thankful to be alive and despite the horrible accident, both cyclists managed to get back in the saddle and went on to complete the stage.
Back in May, Wouter Weyland died from a crash in May's Giro d'Italia. "We can still be happy that we're alive. Nobody can be blamed for this," Hoogerland said. "It's a horrible accident and I was in it but I said to (Juan Antonio) Flecha, 'We're still alive and Wouter Weylandt died in a crash."
You can watch the video below to see the car swerving and knocking the cyclists down.