Just putting a thread in here to store information about the widths of various cycle lanes and shared spaces in Edinburgh. So far I've measured either inside the white lines or between kerbs/verges, depending on which is more usable in practice.
On an editable map here:
https://drive.google.com/open?id=1n_NI5LZQc2ECs6Z8VWCov48LESI&usp=sharing
Stenhouse/Balgreen path – 2.7 metres, fully shared space (excluding space for streetlights, etc.)
Middle Meadow Walk cycle lane – 2.3 metres
North Meadow Walk cycle lane - 2.45 metres (west end), 2.35 metres (at MMW), 2.0 metres into two-way lanes (east end)
New Boroughloch cycle lane - 1.85 metres
Meadows-Gifford Park cycle lane - 2.45 metres as two-way lanes
St Leonard's Street cycle lane - 2.0 metres between kerbs, as two-way lanes (usable width less because of accumulated grit)
Innocent Railway tunnel - 2.5 metres, fully shared space; 1.5 metre verges either side
George Street cycle lanes – 2.3 metres, were as two-way lanes, 1.1 metres per lane
Waverley north ramp footway – 1.95 metres maximum, 1.45 metres between bollards
Given that London is building its superhighways to a standard of between 3.0 and 4.0 metres, albeit two-way, our dedicated infrastructure is pretty shy in comparison. The Stenhouse path is good for 30mph if there are no pedestrians around, but the St Leonard's installation is woefully pootley and hard to use because it's so darn narrow and right-angular.
Looking at photographs of continental utopian cycle highways, and London at Blackfriars, if you can almost but not quite fit a car into the width of a single lane, that's about the right width.
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