Yes, that would be interesting.
(Note: Some cabs may be independently owned, I believe.)
imagine if all Islamic cab drivers were required to post an Islamic medallion prominently on the exterior of their cabs (reminiscent of the Star of David patch required of Jews) so that 'infidels' can choose to forgo their 'services' and catch a 'non-Islmic' cab instead.
If they wish to discriminate, turnabout is fair play.