Did anyone visiting Paris today see this?

They must do this every year. When I was in France last april/may, we saw this same "parade" come through Versailles (the town, not the chateau) protesting the same thing. Apparently they didn't get their voices heard last year...

They seem to do this about once a year.

See also the Paris Daily Photo website.

Saw something like this once, except with tracker trailers. As Kent states, it seems to be almost a yearly occurrence.