[Tagging] Is a sidewalk always adjacent to a traversable road?

[Nathan Edgars II]

On 8/27/2011 10:00 PM, Anthony wrote:
> On Sat, Aug 27, 2011 at 9:54 PM, Nathan Edgars II<neroute2 at gmail.com>  wrote:
>> On 8/27/2011 9:26 PM, Anthony wrote:
>>>
>>> Are you saying this is not a highway=sidewalk,
>>
>> Yes.
>
> It quite clearly meets the definition in the wiki for footway=sidewalk.

Then the sidewalk=* tag is useless, since any two-way road would have 
sidewalk=both. But since sidewalk=* is well-used, and not just as 
sidewalk=both, a strip of grass cannot be a sidewalk.