Sentence extended for fatal crash driver

A NSW man who was driving "competitively" when he caused a fatal crash will spend five months extra behind bars following a successful appeal by prosecutors.

Kurt Riley Williams, from Swansea, was sentenced in May to a minimum term of one year and four months behind bars after he pleaded guilty to dangerous driving causing death.

The 22-year-old P-plater denied he was racing when he accelerated away from traffic lights at 100km per hour in Newcastle in 2012, hitting a car driven by Joanne Warburton.

But the sentencing judge found Williams had been driving "competitively".

Ms Warburton suffered skull, chest and lung injuries and died at the scene.

Her son, who had been following in a separate car, witnessed the crash.

The Crown launched an appeal against Williams' sentence, arguing it failed to adequately reflect the objective criminality of the offence.

The NSW Court of Criminal Appeal upheld the appeal, sentencing Williams to a total two years and eight months jail, with a non-parole period of one year and nine months.