[Tagging] Differences in cycleways

[Robert Elsenaar]

Looking on tags for cycleways I find 3 different types: 
highway=cycleway: obvious these are free ways like here (http://maps.google.nl/maps?hl=nl&ie=UTF8&ll=51.810446,5.173895&spn=0.00589,0.021136&z=16&layer=c&cbll=51.810477,5.173954&panoid=AELkS3h8zmUs821tPi1K-w&cbp=12,36.33,,0,6.46)
cycleway=lane: obvious a part of the carway mostly indicated by picture on the street or with a other colour. (http://maps.google.nl/maps?hl=nl&ie=UTF8&ll=52.26387,5.612104&spn=0.002915,0.010568&z=17&layer=c&cbll=52.263947,5.612153&panoid=thvZenaicJdRuC6vD3hZuA&cbp=12,31.36,,0,1.63)

But ...... now there is a problem.

cycleway=track
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Who can give me examples on Google street view of what we have to concider to be cycleway-tracks?

-Robert-
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