Without doing a 'ride along' or maybe reviewing citations, we have little way to know what is actually being 'enforced' out there on the streets.

The bums flying signs didn't disappear until after the motorist version appeared on signs at major intersections here in Springfield.  

There were plenty of bums from 2006 (the date of the ordinance you cited) until that vehicle ordinance went into effect, so I'm betting on the motorist ordinance being the effective one.