The term 'committee' can be a barrier to participation and input. I find it puts people into an unnecessarily formal and defensive frame of mind. We're trialling 'learning groups' or 'business improvement groups' that bundle up all the other business needs that need review and make H&S an integrated part of the wider discussion.
Too early to tell if it will be effective long term - but committees weren't working so something had to change....

Best one I saw was written/drawn on a shop window by a cop managing the CTV building collapse site and search/rescue after the CHC earthquakes.

I agree with Peter. Let's move away from focusing on the rear view mirror when driving.