IIRC, Fords with a PowerStroke can be limited as far as the maximum cruise control speed. In other words, the ECM can be programmed to allow a maximum cruise speed of say, 70mph. If the driver is running at 80mph and set the cruise it will engage and settle back to 70mph. I don't think you can set a maximum road speed.
As far as GM or Dodge/Sprinter, I have no idea.
Rex