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Increasing the quality of the routes found by CycleStreets means using more sources of good quality data. For instance, a cycle lane can improve a planned cycle journey, but not if the cycle lane is too narrow. On the other hand if the cycle lane is wide and has a good surface, it can be better than a shorter route on a busier road.
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http://www.cyclestreets.net/blog/2011/07/20/detailed-cycling-data-dft
Data is for England but this development, where data collected for another project, will be publicly available, is important for the improvement of cycle journey planning.
Directly related to this is further programming and development work by CycleStreets is very valuable.