I've just seen this petition on one the UK Stone Circles Facebook Page ..
https://www.change.org/p/wilts[...]ge-bypass-avebury-stone-circle

I can see why visitors to Avebury might think a bypass is a good idea as heavy goods vehicles do trundle through on a daily basis, not to mention high volumes of commuter traffic and two double decker buses an hour but where would a bypass go without destroying the World Heritage Site which includes Silbury and Windmill Hill. Quite a few people have signed the petition but I wonder how many of them could come up with a viable alternative route.
(PS: I haven't signed it.)