[Talk-us] [Talk-us-newyork] Highway classification guidelines for New York State

[Mateusz Konieczny]

Sep 13, 2021, 10:43 by minh at nguyen.cincinnati.oh.us:

> Vào lúc 16:47 2021-09-12, Eric Patrick đã viết:
>
>> I have a thought regarding trunks in regards to functional classification, and this is going to come from a different viewpoint. Why not make Primary Arterials trunk roads, from a coding standpoint. They're coded lower than a motorway, but higher than everything else. Any GPS system will use the highest coded route, with the fewest penalties, they can get to between points A and B. I understand that in doing this, a lot of downtown areas will look like a sea of red, due to the density of the Primary Arterials within those areas (cue Brian's groan about this).
>>
>
> As far as I can tell, no mainstream OSM-based router directly penalizes a road based on its highway=* value per se. If it lacks a maxspeed=* tag and real-time or historical traffic data is unavailable or unsupported, then the router would assume a speed limit based on the highway=* value. From what I've seen, these assumptions are usually wrong for... just about everywhere.
>
bicycle-focused and foot-focused ones often try to avoid large roads,
highway=track is often avoided (though maybe it would not be described as a road).

>> Functional classification isn't going for looks, though, it's going for function. The states have spent a lot of time and effort since FC was first introduced about a decade ago.
>>
>
> OK, but is it a good fit? The highway=* key (other than highway=motorway) is defined as indicating the road's importance in the road network. [1] That sounds vaguely functional. But the ultimate goal of this key is indeed "going for looks", and optimal routing behavior, because OSM data is primarily used by renderers and routers.
>
Though functional classified roads (not by number of lanes of something) are very useful.

When I was designing new road style for OSM Carto it was quite irritating that in many regions
people used highway=trunk for "double carriageway road" or "designated as expressway".

It made basically impossible to have decent rendering on lower zoom levels that would show
basic structure of a road network.
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