A man in Lianyungang, Jiangsu province, was fined by the police for painting a road sign by himself.

The 28-year-old, surnamed Cai, brought a brush, ruler and some white paint Nov 27 to an intersection he frequently passed. An arrowhead allowing vehicles to go straight was added by Cai to the original sign, which had only allowed left turns and U-turns.

Cai later confessed that he passed the intersection almost every day by bus and knew that the lanes for vehicles going straight through the intersection were usually blocked. To get home faster, he decided to change the road sign to add an extra lane for vehicles going straight.

The local traffic police department said that the road signs were specially designed after doing an investigation. What Cai did might cause traffic jams and lead vehicles going straight to crash into those turning left.

Police removed the added road sign and fined Cai 1,000 yuan ($151) for his illegal actions.

Liu Maomao contributed to this story.