Bonne conduite

In France, when passing the driving license test, a new driver has 6 penalty points (at first, and then 12 after three years without point loss), which can be deducted for various infractions, like speed driving. Points can only be recovered by attending traffic safety classes. Producer Patrick Godeau asked Jonathan Barré to make a movie about such classes, but Barré declined, because Coline Serreau made a famous documentary on this topic a few years ago: Tout est permis (2014). He liked the setting though, as these classes are open to everyone, meaning this is a way to meet people one would normally never meet otherwise. Godeau insisted by suggesting making it into a genre movie, and only then did Barré had the idea of a revengeful serial killer working as an instructor for traffic safety classes by day.

A GPS beacon does not have such precise accuracy.

References Intriga Internacional (1959)