Cars featured here include a DS, SM, and a Alpine A110. Oh and I believe I saw a BMW bike as well
Police et gendarmerie : Citroën SM / DS Alpine A110 (http://www.youtube.com/watch?v=d2JL9IQ7bUg#)
So he's saying the SM does 240kph (159 mph)
the DS 220kph (137)
and the Alpine 210kph (130)
I would say the Alpine is a horrible choice for chasing down miscreants on a motorway.
And I'm highly dubious than the DS could do 220 - maybe downhill with a following wind and 10 minutes of your time. More like 195kph.