From OpenStreetMap Wiki
Long time mapper currently living on the Isle of Anglesey, Wales.
In the UK, almost all cycleways permit pedestrian usage. You therefore do not need to add a foot=* access tag unless pedestrian use is expressly forbidden.
|Image||Description||Path at roadside||Path separate from road|
|Shared cycle/pedestrian path||highway=??; cycleway=track; segregated=no||highway=cycleway;segregated=no|
|Segregated cycle/pedestrian path||highway=??; cycleway=track; segregated=yes||highway=cycleway; segregated=yes|
|Cycle only path
|highway=??; cycleway=track; foot=no||highway=cycleway; foot=no|