Two projects could not be rated because they had only just been completed at the time of he evaluation. Depending on future traffic development these might reasonably be expected to be rated as "Satisfactory" at some point in the future, although initial traffic levels on a part-completed motorway were below forecast. Another two projects were rated as less than satisfactory: one suffers from low traffic levels, and the other has suffered cost overruns which are reducing the economic benefit.
Traffic levels have been lower than expected on a further two projects, both roads, but not to the extent that the economic viability of the projects has been compromised. In the first case, the problem is a combination of wider economic problems reducing traffic levels and a delay in completing a linked section of motorway. For the second, a combination of lower than expected traffic growth due to regional economic problems, and exogenous factors, has resulted in traffic which is lower than the Provider's projections - but not the Promoter's.