Matthew Broderick did the same thing and killed two people.
He got a fine of $175.00
On August 5, 1987, while driving a rented BMW in Enniskillen, Northern Ireland, Broderick crossed into the wrong lane and collided head-on with a Volvo driven by Anna Gallagher, 28,[34] accompanied by her mother, Margaret Doherty, 63, killing both instantly. He was vacationing with Jennifer Grey, whom he began dating in semi-secrecy during the filming of Ferris Bueller’s Day Off; the crash publicly revealed their relationship. He had a fractured leg and ribs, a concussion, and a collapsed lung. Grey received minor injuries, including whiplash.
Broderick told police he had no recollection of the crash and did not know why he was in the wrong lane: “I don’t remember the day. I don’t remember even getting up in the morning. I don’t remember making my bed. What I first remember is waking up in the hospital, with a very strange feeling going on in my leg.” He was charged with causing death by dangerous driving and faced up to five years in prison, but was later convicted of the lesser charge of careless driving and fined $175
I can sympathise with these cases where Americans cause traffic accidents in the UK because they aren’t used to driving on the left, I’m sure that in most cases it is unintentional and that should be reflected in the sentence, but that said drivers have a responsibility to understand the rules of the road and take care to observe them, and be held to account for failing to abide by them. I think 5 years would have been too harsh, but a $175 fine for causing an accident which killed someone is a little on the light side.