A businessman who attacked a passenger in a car which had overtaken him was jailed for four weeks on Monday.

See Kuan Long, 62, had pleaded guilty to punching Mr Lim Beng Hooi, 34, on his face and head multiple times at the junction of Balestier and Thomson roads on Nov 6 last year. A court heard that Ms Lim Chai Hong, 29, was driving her father and the victim along Balestier Road when she overtook See's car on the right lane.

When both cars stopped at the traffic red lights, See alighted. He gesticulated and banged on the front passenger seat window of Ms Lim's car.

When her father wound down the window, an agitated See shouted: "How can you drive like that? You think this is your grandfather's road? You talk like that, then you better come out and talk.''

See's wife and daughter managed to pull him back. Shortly, See returned to Ms Lim's car and tried to pull her father out. Mr Lim quickly alighted and tried to find out why See was behaving that way.

See released his grip but began shouting and approaching Mr Lim aggressively, stamping his feet and swinging his arms wildly.

Fearing for his safety, Ms Lim and her father got down and stood in between the two men. See then punched Mr Lim on his face once and punched him more than a dozen times while Mr Lim was holding onto his head.

Both men fell into the back seat of See's car during a struggle. See continued to rain punches at the victim's face and head until Ms Lim and See's wife pulled him away.

Mr Lim was granted two days medical leave. See could have been jailed for up to two years and/or fined for causing hurt.