Silvertown Tunnel campaign needs your support

Not doing anything is not an option, and the campaign is missing the point by assuming that the problem is private cars. This is central London, and maybe 70% of the problem is more like commercial traffic of various sizes, minicabs, black cabs and buses.

That's an interesting conjecture. Where do you get 70%?
Anecdotally whenever there is a tailback along Jamaica Road of drivers trying to go through the Rotherhithe Tunnel (a lot of this of late) the vast majority of drivers are in private cars (Cabbies must pick up on this when it happens and find alternatives like Tower bridge)