The father raced a fellow motorist along M62 at 100mph before killing his three-year-old son and scarring his daughter for life in a horrific crash.
Israr Muhammed, 41, was racing against Adam Molloy, 29, on the M62 when his Honda Civic sped off down an embankment and then hit a tree.
Following the crash, Muhammed's son, Say Han Ali, 3, suffered catastrophic head injuries as the car rolled across all three motorway lanes. The boy later died.
Muhammed's daughter, who was 7 at the time, sustained multiple facial injuries, including a fracture to her left eye socket.
His wife, Safeena Ali, also suffered multiple head and internal injuries and remained in a coma for more than a month.
The couple's eight-year-old son, who was also in the vehicle at the time, suffered minor injuries.
Dashcam footage before the crash shows Malloy and Muhammed speeding on the M62.
The pair race on the outside lane with Muhammed's Honda Civic on the lead. Malloy's car, also a Honda Civic, follows at high speed as they overtake other motorists.
The driver filming the incident is driving in the middle lane at the speed of 88mph.
At one point during the 16-second clip, Malloy's car is less than ten meters away from Muhammed's before they speed out of view.
As per police reports, less than a minute later, a tire on Muhammed's car blew out, leading to the crash.
Following the incident, the police arrested the dad while Malloy fled the scene. However, detectives later detained him.
They charged Muhammad with causing death by dangerous driving, two counts of causing serious injury by dangerous driving, and causing death while uninsured.
Meanwhile, Molloy received charges of causing death and two counts of causing serious injury by dangerous driving.
In their trial, the court sentenced both men to four-and-a-half years in prison. Judges also disqualified them from driving for six years and three months.
The sentencing judge David Tremberg told the court:
"Expert assessment of the footage reveals that each of you was traveling in excess of 100mph. And there were roughly 10 meters between your cars as you sped along."
"Other drivers formed the impression that you were racing and driving like idiots."
"This competitive driving started someway back before it was captured on dashcam footage."
The judge continued:
"You, Israr Muhammed, had safe choices you could have made."
"Nobody forced you to exceed the speed limit. Or stay pigheadedly in the outside lane of the motorway as the middle lane was clear for a long stretch."
"The rules of the road are there for a reason. Each of you is guilty of creating an obvious, foreseeable and avoidable risk and dangers to yourselves and other road users."
"This young boy was entirely blameless and had his whole life ahead of him."