Translate the following English sentence to French:
"The principle of subsidiarity is all very well - although I feel that it would be grossly inappropriate to take away the licences of all drunk drivers - but the problem is working out at what point a driver is to be considered drunk according to our highway code."
D'accord sur le principe de subsidiarité - je pense toutefois qu'il est ridicule de retirer le permis de toutes les personnes ivres -, mais le problème consiste à comprendre quand, d'après notre code de la route, les conducteurs doivent être considérés ivres.