bus.lua

-- Bus profile

api_version = 4

Set = require('lib/set')
Sequence = require('lib/sequence')
Handlers = require("lib/way_handlers")
Relations = require("lib/relations")
TrafficSignal = require("lib/traffic_signal")
find_access_tag = require("lib/access").find_access_tag
limit = require("lib/maxspeed").limit
Utils = require("lib/utils")
Measure = require("lib/measure")

function setup()
  return {
    properties = {
      max_speed_for_map_matching      = 180/3.6, -- 180kmph -> m/s
      -- For routing based on duration, but weighted for preferring certain roads
      -- weight_name                     = 'routability',
      -- For shortest duration without penalties for accessibility
      -- weight_name                     = 'duration',
      -- For shortest distance without penalties for accessibility
      weight_name                     = 'distance',
      process_call_tagless_node      = false,
      u_turn_penalty                 = 0,
      continue_straight_at_waypoint  = true,
      use_turn_restrictions          = false,
      left_hand_driving              = false,
      traffic_light_penalty          = 0,
    },

    default_mode              = mode.driving,
    default_speed             = 10,
    oneway_handling           = true,
    side_road_multiplier      = 0.8,
    turn_penalty              = 7.5,
    speed_reduction           = 0.8,
    turn_bias                 = 1.075,
    cardinal_directions       = false,


    -- a list of suffixes to suppress in name change instructions. The suffixes also include common substrings of each other
    suffix_list = {
    },

    barrier_whitelist = Set {
      "gate",
      "lift_gate"
    },

    access_tag_whitelist = Set {
    },

    access_tag_blacklist = Set {
    },

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

    restricted_access_tag_list = Set {
    },

    access_tags_hierarchy = Sequence {
    },

    service_tag_forbidden = Set {
    },

    restrictions = Sequence {
    },

    classes = Sequence {
    },

    -- classes to support for exclude flags
    excludable = Sequence {
    },

    avoid = Set {
      'construction',
      'proposed'
    },

    speeds = Sequence {
      highway = {
        motorway        = 90,
        motorway_link   = 45,
        trunk           = 85,
        trunk_link      = 40,
        primary         = 65,
        primary_link    = 30,
        secondary       = 55,
        secondary_link  = 25,
        tertiary        = 40,
        tertiary_link   = 20,
        unclassified    = 25,
        residential     = 25,
        living_street   = 10,
        service         = 15
      }
    },

    service_penalties = {
    },

    restricted_highway_whitelist = Set {
    },

    construction_whitelist = Set {
      'no',
      'widening',
      'minor',
    },

    route_speeds = {
    },

    bridge_speeds = {
    },

    -- surface/trackype/smoothness
    -- values were estimated from looking at the photos at the relevant wiki pages

    -- max speed for surfaces
    surface_speeds = {
    },

    -- max speed for tracktypes
    tracktype_speeds = {
    },

    -- max speed for smoothnesses
    smoothness_speeds = {
    },

    -- http://wiki.openstreetmap.org/wiki/Speed_limits
    maxspeed_table_default = {
    },

    -- List only exceptions
    maxspeed_table = {
    },

    relation_types = Sequence {
    },

    -- classify highway tags when necessary for turn weights
    highway_turn_classification = {
    },

    -- classify access tags when necessary for turn weights
    access_turn_classification = {
    }
  }
end

function process_node(profile, node, result, relations)
  -- parse access and barrier tags
  local access = find_access_tag(node, profile.access_tags_hierarchy)
  if access then
    if profile.access_tag_blacklist[access] and not profile.restricted_access_tag_list[access] then
      result.barrier = true
    end
  else
    local barrier = node:get_value_by_key("barrier")
    if barrier then
      --  check height restriction barriers
      local restricted_by_height = false
      if barrier == 'height_restrictor' then
         local maxheight = Measure.get_max_height(node:get_value_by_key("maxheight"), node)
         restricted_by_height = maxheight and maxheight < profile.vehicle_height
      end

      --  make an exception for rising bollard barriers
      local bollard = node:get_value_by_key("bollard")
      local rising_bollard = bollard and "rising" == bollard

      -- make an exception for lowered/flat barrier=kerb
      -- and incorrect tagging of highway crossing kerb as highway barrier
      local kerb = node:get_value_by_key("kerb")
      local highway = node:get_value_by_key("highway")
      local flat_kerb = kerb and ("lowered" == kerb or "flush" == kerb)
      local highway_crossing_kerb = barrier == "kerb" and highway and highway == "crossing"

      if not profile.barrier_whitelist[barrier]
                and not rising_bollard
                and not flat_kerb
                and not highway_crossing_kerb
                or restricted_by_height then
        result.barrier = true
      end
    end
  end

  -- check if node is a traffic light
  result.traffic_lights = TrafficSignal.get_value(node)
end

function process_way(profile, way, result, relations)
  -- the intial filtering of ways based on presence of tags
  -- affects processing times significantly, because all ways
  -- have to be checked.
  -- to increase performance, prefetching and intial tag check
  -- is done in directly instead of via a handler.

  -- in general we should  try to abort as soon as
  -- possible if the way is not routable, to avoid doing
  -- unnecessary work. this implies we should check things that
  -- commonly forbids access early, and handle edge cases later.

  -- data table for storing intermediate values during processing
  local data = {
    -- prefetch tags
    highway = way:get_value_by_key('highway'),
    railway = way:get_value_by_key('railway'),
  }

  -- perform an quick initial check and abort if the way is
  -- obviously not routable.
  -- highway or route tags must be in data table, bridge is optional
  if (not data.highway or data.highway == '') and
  (not data.railway or data.railway == '')
  then
    return
  end

  handlers = Sequence {
    -- set the default mode for this profile. if can be changed later
    -- in case it turns we're e.g. on a ferry
    WayHandlers.default_mode,

    -- check various tags that could indicate that the way is not
    -- routable. this includes things like status=impassable,
    -- toll=yes and oneway=reversible
    WayHandlers.blocked_ways,
    WayHandlers.avoid_ways,

    -- check whether forward/backward directions are routable
    WayHandlers.oneway,


    -- compute speed taking into account way type, maxspeed tags, etc.
    WayHandlers.speed,

    -- set weight properties of the way
    WayHandlers.weights,
  }

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

function process_turn(profile, turn)
  -- Use a sigmoid function to return a penalty that maxes out at turn_penalty
  -- over the space of 0-180 degrees.  Values here were chosen by fitting
  -- the function to some turn penalty samples from real driving.
  local turn_penalty = profile.turn_penalty
  local turn_bias = turn.is_left_hand_driving and 1. / profile.turn_bias or profile.turn_bias

  if turn.has_traffic_light then
      turn.duration = profile.properties.traffic_light_penalty
  end

  if turn.number_of_roads > 2 or turn.source_mode ~= turn.target_mode or turn.is_u_turn then
    if turn.angle >= 0 then
      turn.duration = turn.duration + turn_penalty / (1 + math.exp( -((13 / turn_bias) *  turn.angle/180 - 6.5*turn_bias)))
    else
      turn.duration = turn.duration + turn_penalty / (1 + math.exp( -((13 * turn_bias) * -turn.angle/180 - 6.5/turn_bias)))
    end

    if turn.is_u_turn then
      turn.duration = turn.duration + profile.properties.u_turn_penalty
    end
  end

  -- for distance based routing we don't want to have penalties based on turn angle
  if profile.properties.weight_name == 'distance' then
     turn.weight = 0
  else
     turn.weight = turn.duration
  end

  if profile.properties.weight_name == 'routability' then
      -- penalize turns from non-local access only segments onto local access only tags
      if not turn.source_restricted and turn.target_restricted then
          turn.weight = constants.max_turn_weight
      end
  end
end

return {
  setup = setup,
  process_way = process_way,
  process_node = process_node,
  process_turn = process_turn
}