From OpenStreetMap Wiki
|cycleway:right = track|
|A track only on one side of the road|
|Used on these elements|
|Status: in use|
|Tools for this tag|
A track only on one side of the road. You can drive in both directions.
- In one-way roads use cycleway=track, since it is apparent that there is only one cycle track. Unless the one-way road may be used in both directions of cyclists (cycleway=opposite_track) and there are 2 bike trails.
Left or right depend on the direction in which the way is drawn in OpenStreetMap.