Ryan Wenzlick launched an "explosively violent" attack on his ex lover's partner.
The 50-year-old also has to serve half her sentence in prison.
The 47-year-old pleaded guilty and will now attempt a restorative justice conference.
The 81-year-old had struggled dealing with the road-rage incident last month.
The woman was now on leave after comments on social media.
Hamilton District Court was shut down within 20 minutes of opening today.
The court house went into lockdown before 10am today.
The crash happened near Gordonton about 11am today.
The man asked to cut in front of her at the checkout - then paid for her groceries.
Ngawai Himiona is being farewelled in Tauranga this morning.
The Cambridge-based jockey was remanded on bail without plea until next month.
Justice Matthew Muir released his 300-page reserve decision this morning.
Sean McKinnon's sisters have shared their thoughts on today's sentencing.
A judge delivered his sentence to Mark Garson in the High Court at Hamilton today.