Support for a FollowTheSignage instruction

[daniel-j-h]

There are situations for which following a sign is the proper hint for users.

For example: the noref=yes sign which represents an exit without further details.

http://taginfo.openstreetmap.org/tags/noref=yes#wiki

We should think of adding a instruction for these situations to the api in v6.

(Another use-case would be: complex situations we just can't handle. Acknowledge this and let make the user aware of it)

@pratikyadav @MoKob

[willwhite]

What would the difference between this and how we handle destinations?

[daniel-j-h]

@willwhite maybe the description for this ticket wasn't detailed enough. Here is a situations I can think of where a "follow the sign" instruction could help:

We know the situation is too complex to issue tons of instructions every other second for but the user can happily make its way through the situation using signs: think about an airport terminal with multiple ways forking and merging where all you want to say is "follow the sign to terminal 2".

Another situation could be complex roundabouts: for roundabouts we already acknowledge lanes inside them are too complex to handle and country-dependent. We simply remove lanes from roundabouts completely. Similarly crossing roundabout types we do not handle yet could be announced as "follow the signs to cross the roundabout".

[1ec5]

We know the situation is too complex to issue tons of instructions every other second for but the user can happily make its way through the situation using signs: think about an airport terminal with multiple ways forking and merging where all you want to say is "follow the sign to terminal 2".

Project-OSRM/osrm-text-instructions#41 and Project-OSRM/osrm-text-instructions#30 suggest that OSRM Text Instructions or a client navigation SDK has almost enough context to rewrite instructions this way without requiring explicit “follow the sign” instructions from the API.

[1ec5]

Per #3304 (comment), OSRM would need to provide OSRM Text Instructions with the contents of the destination:to and destination:ref:to tags in order to reliably say “follow the signs to” in a complex freeway interchange.

[github-actions]

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[1ec5]

The destination_sign relation type might also be useful for consolidating instructions: #6554.

[github-actions]

This issue seems to be stale. It will be closed in 30 days if no further activity occurs.