Having read so many cycle bashing comments on here over the years I was wondering whether all cyclists should take to public transport or their cars (you know some of us have cars too you know and pay road tax) on a specific day every year. It would probably be grid lock and maybe just maybe some people who point blank hate ALL cyclists might realise that we are actually doing people a favour for not taking to our cars! 
Suggestion for the best day of the year for most impact would be gratefully received.
Information on how many cycle journeys are made per day would also help to give some idea of what the roads and public transport might be like if there were no cyclists!!