One way to help promote safe cycling - and cycling generally - is to join CTC, and possibly sign up as a Right to Ride rep.
Another way is to join a local cycling group. There are lots! Many are affiliated to the Cycle Campaign Network. Here are some I know about:
You can also support these other organisations who campaign for safer streets by reducing the danger at source:
Organisations and companies to avoid supporting:
If you know of a great group near you, please
let me know.