That's correct, tpm. See this link.
http://www.bristolpost.co.uk/huge-r...are-scrapped/story-29491001-detail/story.html
When it was first proposed to continue the Avon ring road from Hicks Gate around the edge of south Bristol to the Long Ashton bypass (at least a decade ago from memory) various people organised themselves into groups to protest. The outline route was up the hill from Hicks Gate around the edge of a golf course, skirting the Bristol suburb of Stockwood, before crossing the A37 just south of Whitchurch Village. The route would then have continued through housing estates between the Bristol part of Whitchurch and the eastern edge of Hartcliffe to the big Hengrove roundabout, and then along the existing dual carriageway to where the SBL link now starts just to the east of Hareclive Road.
All sorts of environmental objections were thrown up but a major sticking point (as tpm pointed out) was the need to demolish houses to enable the route to squeeze through the section between Whitchurch and Hartcliffe.
As it stands the route east from the end of the SBL uses the dual carriageway I mentioned to Hengrove roundabout then along what is known as a ring road (Bristol seems to have many ring roads and circuit roads that are only partially built) and is dual and passes Hengrove Leisure centre to Airport Road (which is not dual), across the A37 into Callington Road (dual carriageway in places) to the A4 at Brislington. Once the A4 is reached it is followed to Hicks Gate.The linked press report above talks of a Callington Road Link which the mayor and the local Labour party believe would be better value for money.
I use these roads regularly and traffic frequently queues (not just at peak times) at such places as the ATS-controlled junction with the A 37 and approaching the A4 where the road joins the busy local road, West Town Lane, before reaching the A4 with ATS controls at both junctions. The A4 itself at Brislington is often a nightmare with slow-moving traffic throughout the day.
I really don't know what is meant by a Callington Road Link as I can't see anywhere that a road could be accommodated.