Three children are in hospital with serious injuries after a car crashed into a telegraph pole in Sydney's west on Monday.

Just after noon, a white stationwagon careered off Second Avenue in Kingswood and slammed into a telegraph pole, an Ambulance NSW spokeswoman said.

One child was airlifted to hospital via CareFlight. Two other children were taken to Westmead Children's hospital by road ambulance. They are in a serious to critical condition.

Advertisement

An adult male was taken to Nepean Hospital in a stable condition.

Transport authorities say buses on routes 774, 775 and 776 are diverting from Second Avenue and missing two stops.

More to come.