The victim will spend the next month in a rehabilitation unit learning to be independent again, according to a victim impact statement.

Soo Hong Kim was convicted on Tuesday of negligent driving occasioning grievous bodily harm. Kim, of Gungahlin, admitted hitting the Harley-Davidson rider when he failed to give way at the intersection of Majura Road and the Federal Highway about 11am on January 2. The rider's left leg was crushed, causing multiple fractures to his foot and leg and artery damage.

He underwent surgery at The Canberra Hospital, but the damage was so serious that the leg required amputation above the knee.

The victim, in his statement, said he had little memory of the accident, but had no ill feelings for Kim.

"Rather, I recognise that everyone makes mistakes," the statement read.

The 58-year-old must learn to use a wheelchair and crutches before he can progress to a prosthetic leg. The injury means the NSW man will not be able to continue his job as a water truck driver.

The victim said he would contemplate his future employment prospects after he was discharged from rehab.

Kim, a Korean national, is in Australia on a temporary work visa and is employed as a cleaner.

Kim's defence lawyer said the 28-year-old was deeply remorseful for the accident and offered the court $1755 in cash to help the victim's recovery.

The defence said Kim had that morning dropped his girlfriend at Sydney Airport about 5am and driven back to Canberra.

Magistrate Peter Dingwall said motorists made mistakes while driving and accepted the accident was the result of momentary inattention.

But he said drivers should be aware they were in charge of a lethal weapon.

The magistrate ordered Kim to sign an 18-month good behaviour order with a $1000 security.

Kim was also disqualified from driving for six months and ordered to pay court costs.

Mr Dingwall said the $1755 should be delivered to the victim as compensation as it was "better in [his] pocket than ACT coffers".