What is the distance from Calais to Cap Gris-Nez?

There are about 31.6km between Calais, France and Cap Gris-Nez.
This is the route:
  1. Take A16 BOULOGNE, from Calais, to SORTIE (EXIT) 36 towards MARQUISE and RINXET; turn right off the exit ramp onto D191 towards CAP GRIS-NEZ.
  2. Take D191 to Cap Griz-Nez.