A young driver has been jailed for seriously injuring a woman when he ran a red light at 110 km/h just hours after injecting the drug ice, then fleeing and hiding in a garden.

Kieron Thomas, 20, pleaded guilty to negligently causing serious injury to 42-year-old Ballarat mother and hospital worker Sherridan Rizzoli on February 16 last year as he evaded police at high speed.

Thomas, a learner driver in an unregistered car, struck Ms Rizzoli's car at an intersection in suburban Ballarat, causing her vehicle to rotate into an electrical pole.

He took his hands off the steering wheel and took no evasive action other than attempting to brake.

Ms Rizzoli suffered fractures to her lower back, a broken pelvis, two broken vertebrae, a large hernia, severed nerves in her right arm and was airlifted to Melbourne for treatment.