SPEEDING teenage biker Norman Frost crashed into a car and then drove off leaving his 16-year-old girlfriend injured in the road, a court heard.

The impact threw Frost and pillion passenger Tara Dawson off his quad bike as he lost control on a bend, Stoke-on-Trent Crown Court heard.

But the jury was told that Frost left Tara at the crash scene, got back on his bike and drove four miles to his Goldenhill home.

Tara, who also lived in Goldenhill, was taken to the University Hospital of North Staffordshire where she died four days later.

Now Frost has gone on trial after pleading not guilty to causing Tara's death by dangerous driving. The 19-year-old, of Hollywall Lane, has already admitted causing death by careless driving.

Prosecutor Robert Price told the court: "The defendant drove the quad bike extremely dangerously that night – quite simply it was madness.

"He drove at excessive speeds in a built-up area, in the vicinity of an extremely sharp bend.

"We say it was a highly dangerous manoeuvre, which fell far below the standard expected of a careful driver."

The court heard Frost lost control on a sharp bend in High Street, Newchapel, on June 22 last year near the junction with Pennyfields Road.

The bike strayed on to the wrong side of the road and crashed into a Citroen Picasso.

Picasso driver Joanne Edwards, who had been waiting to turn left into Pennyfields Road, told the jury: "My impression was the driver was showing off, because he was driving fast and looking over his shoulder.

"When the bike hit me he hit the windscreen. He rolled off the car and landed on the ground. Then he got back on the bike and rode off."

The jury heard that a nail was later pushed into one of the tyres on the quad bike to make it look like the accident was caused by a blow-out.

But a police expert later ruled that the crash had not been caused that way.

The jury was told Frost later called police about the accident and was arrested on June 26, 2009.

The prosecution claims he knew about the nail planted in the bike's tyre and during his first interview told officers the accident was a result of a tyre blow-out. The trial continues.