[Tagging] Forward/backward routes

Paul Johnson baloo at ursamundi.org
Tue Aug 20 00:30:17 UTC 2019


On Mon, Aug 19, 2019 at 7:29 PM Peter Elderson <pelderson at gmail.com> wrote:

>
> Op 20 aug. 2019 om 01:44 heeft Paul Johnson <baloo at ursamundi.org> het
> volgende geschreven:
>
> On Mon, Aug 19, 2019 at 6:23 PM Peter Elderson <pelderson at gmail.com>
> wrote:
>
>> Well, the simple version I got from bicycle route mappers is: members in
>> the main direction have no roles. The fact that there is a role tells you
>> it’s a way for the opposite direction, and then forward tells you the
>> opposite travel direction goes against the mapped direction of that member
>> way, and the backward role tells you the opposite travel direction goes
>> with the mapped direction of the way.
>>
>
> If the way is traversable as part of the route in both directions, then
> this is correct.  If the route only applies to one direction, then you do
> need to specify forward or backward.
>
>
> Then, the roles forward and backward may both apply to ways in both travel
> directions? And then there is traffic direction, which is also not the same
> as mapped direction, and may be different for different transport modes...
>

If it applies in both directions, then no role is necessary.  This is how
routes can work regardless of which way the way faces or even it's oneway
status if various modes can go against the oneway.
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