[talk-au] Emergency services u-turn connections on freeways

[Brendan Barnes]

Hi all,

When looking at Hume Freeway data lately, I notice a number of the sealed
links between the two carriageways are tagged as highway=motorway_link. Eg
https://www.openstreetmap.org/way/728917504/history.

Reading the wiki, motorway_link is for the ramps connecting a motorway to
lower class highways.

Further, checking OSC imagery (and driving past these links a lot), signage
says: No u-turn symbol: "Emergency & VicRoads Vehicles Excepted" in
Victoria. Similar Emergency/NRMA links exist in NSW, and I'm sure the other
states would have similar exemptions.

I can't find Australian Tagging Guidelines on this specifically, so could I
get a general consensus on:

1) These links should change from highway=motorway_link to highway=service.
2) Add emergency=designated to prevent routing issues.
3) Is anything else, like motor_vehicle=permit, or a
restriction=no_right_turn / except=emergency required to be understood by
most routing engines? Or does emergency=designated suffice?

If there's anything else, please let me know. Happy to update tagging
guidelines.

..Brendan
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