Katrina and Karlina Raiba, now aged eight and six, were left with spinal cord injuries after the devastating crash on the A509 in Wellingborough, Northamptonshire, on October 3 last year.
Northampton Crown Court heard that Jaguar Land Rover manager Andrew Nay was “bullying” a woman driving a Mazda people carrier before the smash happened.
Video footage played to the court - and later released by the family - shows Nay, 39, of Harrier Close, Weldon, Corby, pulling right across a junction in his Land Rover Discovery into the path of the victims’ Vauxhall Signum.
He admitted four counts of causing serious injury by dangerous driving, but denied chasing the Mazda before the crash.
Judge Adrienne Lucking QC said: “This was a prolonged, persistent and deliberate course of very bad driving.
“No sentence I can pass will ever feel like enough for this family.”
Addressing Nay, she said: “You maintained an account that was incredible and inconsistent.”