Alexis Sebastien Fleury, 25, performed a U-turn while driving to see his English girlfriend in August 2012 but failed to return to the correct side of the road and crashed head-on with another car, killing the driver.
Fleury was convicted earlier this year of causing the death by careless driving of David Crane, a 62-year-old father of two children, and jailed for
But appeal court judges in London halved this term to nine months, arguing that Fleury, from Orleans, south of Paris, should not have been sentenced as
if he were an Englishman used to driving on the left.
"As a Frenchman, used to driving on the right hand side of the road, he remained on the right hand side of the road after his U-turn," the judges
ruled, according to the reports in The Guardian and the Daily Telegraph newspapers.
They added: "He did a U-turn in the dark in England and, for moments or minutes, forgot that he was not driving in France.
"The culpability of a British driver in the same circumstances would have been very high indeed. For somebody from France, the culpability must be reduced."
Fleury is now likely to be released next week, the reports said.