Critical Mass is excellent as a statement that we want our roads to be safer, more sociable places and less intimidating for non motorised traffic and pedestrians. Although we have great fun in the sun (and rain...) meeting up once a month at the Chinese arch, it has often said that Critical Mass doesn't in itself achieve any of the above aims.
Please have a look at this petition on the number 10 site, and sign it if you agree. It only takes a couple of minutes. http://petitions.number10.gov.uk/mobilemenaceban
The petition is supported by Roadpeace who have some excellent articles regarding road safety and driver behaviour. They are refreshing in their "radical views" that perhaps 3000 people killed on the UK's roads and twice as many seriously injured each year may be too high a cost to pay for our convenience of movement. http://www.roadpeace.org/
It must be stressed that cycling is a very safe activity on the majority of roads in the country. It is important that we help to keep it this way.