The clueless fan who caused a bloody crash during the Tour de France has been arrested after surrendering at a police station, according to reports Wednesday.

The 30-year-old French woman, who has not been identified, was in custody at a police station in Brittany, near where the world’s biggest cycling competition held its first four stages, a source close to the investigation told Reuters.

She is accused of involuntarily causing injury and putting the lives of others at risk — which is punishable with a fine of around $1,700, French news network RTL reported. She also faces up to a year in jail, the Daily Mail reported.

The spectator — seen in pictures holding up a placard that read “Go! Gran, Grandad” in French and German — sent cyclist Tony Martin flying when he clipped her sign Saturday during the race’s first stage, causing others to crash around him.

French authorities previously said the woman fled before investigators could reach her.

“The spectator who caused this accident left the scene before the arrival of the investigators,” a spokesperson for the Finistere police force said, according to the Independent.

“She did not have far to travel to get to the race, and clearly knew how to escape after causing so much damage,” an investigative source told the Mail.

“Numerous witnesses were interviewed, and camera footage was also inspected in order to track the suspect down.”

Ride organizers have said they plan to take legal action against the woman.

“We are suing this woman who behaved so badly,” Tour deputy director Pierre-Yves Thouault told AFP.

“We are doing this so that the tiny minority of people who do this do not spoil the show for everyone.”

With Post wires