[Tagging] man_made=pipeline - is onewayness implied?

[Craig Wallace]

On 2014-06-22 10:08, Pieren wrote:
> On Fri, Jun 20, 2014 at 5:22 PM, fly <lowflight66 at googlemail.com> wrote:
>
>> Better use an own tag like flow_direction=forward/backward/both/none or
>> similar. This way we will cover all three cases mentioned below.
>
> Where is the difference between "flow_direction=forward/backward" and
> "oneway=yes" ? or "flow_direction=both" and "oneway=no" ? About
> "flow_direction=none", then you water stream/canal/pipe is not a water
> stream/pipe/canal (change the primary tag).

The oneway=yes tag is an access restriction, ie which direction you are 
legally allowed to travel along that way. Whereas the flow is what 
direction the water is physically moving. So it makes sense to use 
separate tags for these.

A river may be flowing downstream, but it is usually legal to travel by 
boat in the opposite direction. Or a canal has no flow, but boats can 
travel in either direction.

Craig