Car stopping distances from 60mph/100kph are ~100 metres. 39,888 people died in the US in 2018 from car crashes. [1] Emergency braking distance of a TGV from

Car stopping distances from 60mph/100kph are ~100 metres. 39,888 people died in the US in 2018 from car crashes. [1] Emergency braking distance of a TGV from 300 kmph (186 mph) is something like 3,500 m [2], carrying ~450 people. Moving block signalling systems take into account the current positions and velocities of both trains, and generate a maximum speed and braking curve. See [3] for the details, it's pretty fascinating systems design! [1]: https://en.wikipedia.org/wiki/List_of_countries_by_traffic-related_death_rate https://en.wikipedia.org/wiki/List_of_countries_by_traffic-r... [2]: https://railroads.dot.gov/sites/fra.dot.gov/files/fra_net/16334/1991_SAFETY%20RELEVANT%20OBSERVATIONS%20ON%20THE%20TGV%20HIGH%20SPEED.PDF https://railroads.dot.gov/sites/fra.dot.gov/files/fra_net/16... [3]: https://en.wikipedia.org/wiki/European_Train_Control_System https://en.wikipedia.org/wiki/European_Train_Control_System