Speeding teen caught watching YouTube

A Sydney teenager has had his driver's licence suspended after being caught speeding while allegedly watching YouTube in his car.

The 18-year-old P-plater is accused of driving more than 140km/h in an 80km/h zone at Catherine Field, south west of the city, on Wednesday night.

He was pulled over by police, who saw his mobile phone in the centre console playing videos.

He lost his licence on the spot for six months and copped fines worth more than $2770.