highway=service, access=private and drive-through

[dooley]

How can I find out during osrm-extract (in the LUA) whether a highway allows a complete drive-through or is only permitted for access or exit?

Let's assume that a highway=service, access=private should not be used to drive through without stopping. However, if there is a stop (waypoint) on the highway, this highway should be usable.

I added after all the wayhandlers finished this debugging part:

  WayHandlers.run(profile, way, result, data, handlers, relations)

  local access = way:get_value_by_key("access")
  local highway = way:get_value_by_key("highway")

  if highway == 'service' then
    print("[debug] " .. way:id() .. " highway: " .. tostring(highway))
    print("[debug] " .. way:id() .. " access: " .. tostring(access))
    print("[debug] " .. way:id() .. " fwd_speed: ".. tostring(result.forward_speed))
    print("[debug] " .. way:id() .. " bwd_speed: " .. tostring(result.backward_speed))
    print("[debug] " .. way:id() .. " is_startpoint: " .. tostring(result.is_startpoint))
    print("[debug] " .. way:id() .. " forward_restricted: " .. tostring(result.forward_restricted))
    print("[debug] " .. way:id() .. " backward_restricted: " .. tostring(result.backward_restricted))
    print("[debug] " .. way:id() .. " forward_mode: " .. tostring(result.forward_mode))
    print("[debug] " .. way:id() .. " backward_mode: " .. tostring(result.backward_mode))
  end

and got (for a specific highway):

[debug] 133317903 highway: service
[debug] 133317903 access: private
[debug] 133317903 fwd_speed: 15
[debug] 133317903 bwd_speed: 15
[debug] 133317903 is_startpoint: false
[debug] 133317903 forward_restricted: true
[debug] 133317903 backward_restricted: true
[debug] 133317903 forward_mode: 1
[debug] 133317903 backward_mode: 1

after that i edited the lua and removed the "private" from

    -- tags disallow access to in combination with highway=service
    service_access_tag_blacklist = Set {
        'private'
    },

and got the same debugging output as above, except

[debug] 133317903 is_startpoint: true
Here are the relevant parts from the settings:

    access_tag_whitelist = Set {
      'yes',
      'motorcar',
      'motor_vehicle',
      'vehicle',
      'permissive',
      'designated',
      'hov'
    },

    access_tag_blacklist = Set {
      'no',
      'agricultural',
      'forestry',
      'emergency',
      'psv',
      'customers',
      'private',
      'delivery',
      'destination'
    },

    -- tags disallow access to in combination with highway=service
    service_access_tag_blacklist = Set {
        -- 'private'
    },

    restricted_access_tag_list = Set {
      'private',
      'delivery',
      'destination',
      'customers',
    },

    access_tags_hierarchy = Sequence {
      'motorcar',
      'motor_vehicle',
      'vehicle',
      'access'
    },

    service_tag_forbidden = Set {
      'emergency_access'
    },

    restrictions = Sequence {
      'motorcar',
      'motor_vehicle',
      'vehicle'
    },
     restricted_highway_whitelist = Set {
      'motorway',
      'motorway_link',
      'trunk',
      'trunk_link',
      'primary',
      'primary_link',
      'secondary',
      'secondary_link',
      'tertiary',
      'tertiary_link',
      'residential',
      'living_street',
      'unclassified',
      'service',
      'track'
    },

So i'm not sure if my changes prevent OSRM from drive-thru and only allow allows drive in or out?

Regards, Frank

[shinomontaz]

Hi!

I think that looking only on extraction stage log is not enought to be sure. I'd prefer to test routing on result graf for 100% proof.

What about your config for access_tags:
If a way is in the acess_tag_blacklist or service_access_tag_blacklist, OSRM will not allow routing through this segment unless the route starts, ends, or has a waypoint on it.
This is controlled by how OSRM sets is_startpoint in profile. If a segment is marked as restricted, it will be allowed only at the start or end of a rout, or for a waypoint.

is_startpoint = true means OSRM will allow a route to start or end on this segment (or visit it as a waypoint), even if it’s otherwise restricted.
is_startpoint = false means OSRM will not allow a route to traverse (drive through) this segment unless it’s the start, end, or a via/waypoint.

If we set a waypoint on a restricted segment, OSRM internally allows accessing that segment for entry/exit, even if it's otherwise not traversable.
This is achieved by allowing is_startpoint = true on restricted segments.

So, can you test a with and without private in service_access_tag_blacklist?
Routing through a restricted segment ( no waypoint ) should fail.
Routing to or from a restriced segment, or set a waypoint on it - should succeed.

Seems like that.