I would be interested in more information on this. What's your aim beyond making one road quieter and more pleasant. Won't the effect be to make other places proportionately worse?

If you have lorries banned from Honor Oak Road (I am guessing you think some width restrictions would do the trick) how are the buses going to work?

If your petition is successful, where do you think the traffic will go? I am guessing Devonshire Road and Brockley Rise would probably become busier.

I am entirely in favour of reducing the amount of road traffic, and heavily-polluting vehicles, but this should be co-ordinated across London and not hyperlocal - otherwise you're just pushing the problem on to someone else.