David Spiegelhalter and Mike Pearson calculated driving a car in the UK for 250 mi increases one’s risk of death by 1 micromort, which is 2.48*10^-7 per 100 km.
Motor vehicle road injuries (excluding motorcyclists’) caused 22.1 M years of life lost, and 436 k deaths in 2019, which imply 50.7 years of life lost per death from motor vehicle road injuries in 2019. This times the increase in the risk of death due to driving a car in the UK equals 6.62 person-min less of life expectancy per 100 km.
There were 2.7 road fatalities per 1 billion miles driven by cars in Great Britain in 2024 (see Table 4), 1.68*10^-7 road fatalities per 100 km (= 2.7/​(1*10^9*1.61)*100), 67.7 % (= 1.68*10^-7/​(2.48*10^-7)) as much as I estimated above. As a result, for the above 50.7 years of life lost per death, there is a reduction in life expectancy per 10 km of driving a car of 4.48 min (= 0.677*6.62).
There were 2.7 road fatalities per 1 billion miles driven by cars in Great Britain in 2024 (see Table 4), 1.68*10^-7 road fatalities per 100 km (= 2.7/​(1*10^9*1.61)*100), 67.7 % (= 1.68*10^-7/​(2.48*10^-7)) as much as I estimated above. As a result, for the above 50.7 years of life lost per death, there is a reduction in life expectancy per 10 km of driving a car of 4.48 min (= 0.677*6.62).