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

[Eric Patrick]

*If I'm not mistaken, the code you linked to is specifically a set
of penalties for transitioning to a lower-classed road. [1][2] This is
what I was referring to earlier as "heuristics around avoiding the use of *

*lower-classed roads once you're on a higher-classed road until you get *




*close to the destination". For example, each transition from
a highway=trunk to a highway=primary penalizes the route by 40 seconds
(5 seconds with the shortest-route engine), so the routing engine
would prefer a different route that stays on the trunk road for another
30 seconds based on its speed limit.*

Yes, but those values are assigned to the same road type within the code. A
trunk road isn’t going to have a value of 5 in one place and a different
value somewhere else. Doing that will make routing do some funky things.

On Fri, Sep 17, 2021 at 16:24 Martijn van Exel <m at rtijn.org> wrote:

> Hi Zeke,
> On 9/14/21 8:57 AM, Zeke Farwell wrote:
>
> On Sun, Sep 12, 2021 at 7:52 PM Eric Patrick <txemt1 at gmail.com> wrote:
>
>>  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.
>>
>
> Functional classification isn't going for looks, but the OSM highway=*
> classification is.  [..]
>
> In my mind the opposite is true, so this made me curious. In display maps
> that render based on functional road classes, you will find a consistent
> and complete network visualization across map zooms, whereas OSM will
> display a road network with disconnected segments. Example [1]. Or am I
> missing your point?
>
> Martijn
>
> [1]
> https://tools.geofabrik.de/mc/#7/36.2888/-96.2326&num=2&mt0=mapnik&mt1=here-map
> disclaimer -- I work for HERE but discussing on this list as a private OSM
> citizen.
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