Yup the autoroute to Calais is not the place to push it - there are some fixed cameras too (although not sure whether a ticket from those would ever reach you??).
Over 100mph in an 80mph limit... 90 Euros... You got off light I think
I take it this was some sort of manned radar trap?
Catching speeding UK motorists on the final run in to Calais has been the French Police's idea of ''shooting fish in a barrel'' for years......hardly a sport but they definitely enjoy the game.