sentences:  Land is still reserved in various verges along Talbot Avenue and Wallisdown Road for dual carriageway upgrades.The Fern Barrow and Boundary Lane roundabouts have been built to accommodate this potential future upgrade, with the former being much too large for its purpose and the latter covered in red hatching where a second lane should run (near the university).There is, however, a 'pinch point' around Wallisdown Roundabout which would require a large (and costly) demolition programme that has made the scheme proposals financially unattractive.