A teenager crashed into a cabbie causing a bleed to his brain.
Mason McCallum, 19, ploughed head on with Anthony Martyn's taxi in Glasgow city centre.
McCallum - who had drugs in his system - was speeding away from police moments before the crash.
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The 64-year-old victim was left with a catalogue of injuries including a broken knee cap and ribs.
McCallum pled guilty at Glasgow Sheriff Court to causing Anthony serious injury by dangerous driving on November 1 2021.
The first offender, of Mosspark, also admitted driving with a provisional licence and without insurance.
The court heard that McCallum had been warned by police about his manner of driving at a red light.
McCallum went on to drive slowly down one-way streets before officers followed him as he went faster.
McCallum crashed into barriers and fencing from construction work on Bothwell Street.
He was later observed at a slip road from the city centre going in the wrong direction.
Police flashed blue lights and ordered McCallum to stop he continued in the wrong direction.
Prosecutor Sean Docherty said: "A short distance later, McCallum collided head on with a black cab taxi driven by Anthony Martyn in the correct direction on the off-slip."
McCallum exited the Range Rover he was driving while officers attended to Anthony who was in a state of unconsciousness.
He was noted by medics to have chest, head and leg injuries and was taken to hospital.
McCallum meantime told officers: "I know I've f***ed up, it was all my fault."
He was later tested and found to have 444 micrograms of drug benzoylecgonine in his body when the legal limit is 50 micrograms.
Anthony meantime suffered a fractured thigh bone, a broken kneecap, a chest wound, several broken ribs and sternum as well as a bleed to the brain.
Sheriff Ian Fleming granted McCallum bail meantime and disqualified him from driving in the interim.
He said: "This is a serious matter, don't construe that I have continued bail that you will avoid custody - nothing is ruled in or out."
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