The family of a bus driver who was jailed for crashing into a notorious Melbourne bridge is preparing for him to come home, after his convictions were overturned on appeal.

Key points: Granting Jack Aston's appeal, Justice Stephen Kaye said there had been a "substantial miscarriage of justice"

Granting Jack Aston's appeal, Justice Stephen Kaye said there had been a "substantial miscarriage of justice" Mr Aston has been found guilty of charges that carry lesser penalties

Mr Aston has been found guilty of charges that carry lesser penalties He will remain in prison as he is assessed for a community corrections order

Six people were seriously injured when Jack Aston drove the bus into the Montague Street Bridge in South Melbourne in February 2016.

In October last year, a jury found him guilty of six charges of negligently causing serious injury, and in December he was jailed for five years and three months, with a non-parole period of two-and-a-half years.

But in Victoria's Court of Appeal on Monday, Aston's legal team successfully argued the trial judge was not given the option of lesser charges.

In granting the appeal, Justice Stephen Kaye said there had been a "substantial miscarriage of justice" and the prosecution in Mr Aston's trial "failed" to consider alternative verdicts.

Justice Kaye instead found Aston guilty of six counts of the lesser charge of dangerous driving causing serious injury.

Aston's supporters cheered at the conclusion of Monday's hearing, but he will remain in jail for the time being while he is assessed for a community corrections order.

The bridge was 3 metres high, while the bus was 3.8 metres high. ( Twitter: Metropolitan Fire Brigade )

Aston's wife Wendy said her husband's ten months in prison had been tough for him and the family.

"He's lost 13 kilos — we spend all our time trying to pick him back up again," Mrs Aston said.

"We just want him home. It's going to be a fair climb for him to be back to who he was."

Mrs Aston would not say whether the family would pursue compensation if her husband was freed.

Aston's daughter Meg broke down in tears when asked about how hard it had been to see her father in prison.

(L-R) Aston's son Ben, sister-in-law Leanne Heenan, wife Wendy and daughter Meg said the case had taken a heavy toll on the family. ( ABC News: Emilia Terzon )

"It breaks my heart," she said.

Aston's son Ben said he had a close bond with his father and he was looking forward to working on cars with him again.

"It's been really tough. I want to get out in the shed with him and get it underway," he said.

Earlier, Aston's lawyer Catherine Boston told the court today her client had no knowledge of the bridge "or its notoriety" before embarking on his trip from Ballarat to Melbourne.

Ms Boston told the court Mr Aston had suffered from post-traumatic stress disorder since the accident, that the trial had been "traumatic" for him, and he had been "punishing himself about the collision for the past three years".

"He has been doing everything in jail to better himself," Ms Boston said.

Aston had dropped off passengers at the Melbourne Convention and Exhibition Centre and was taking 14 others to a hotel on St Kilda Road when the crash occurred.

There was a sticker on the driver's instrument panel indicating the height of the bus was 3.8 metres, the County Court previously heard.

The Montague Street Bridge is 3 metres high.

In sentencing Aston, County Court Judge Bill Stuart said that he was "astonished" the driver did not notice the bridge.

Gold Bus founder Donald McKenzie told a plea hearing last year that Aston had been "let down by the company" as it did not warn him of the driving conditions in the area.

VicRoads installed an overhead height warning system at the bridge after the incident. ( ABC News: Danielle Bonica )

But Judge Stuart said employers could not be blamed for the "obvious failings" of their employees.

A few months after the accident, VicRoads installed rubber flaps on an overhead gantry to warn drivers of the bridge's low clearance.

Aston's family, friends and supporters from Ballarat last year accused the courts of "victimising" him and rallied at the Montague Street Bridge to call for his sentence to be reduced.