Audible fences should not be barriers

[tombay]

Investigating a routing issue I discovered that the node in question (431495501) was described thus:
barrier=fence
sensory=audio

(I have also seen sensory=audible)

In Australia we have audible fences that are used to prevent livestock (and wild dogs etc) from passing the barrier. These fences do not stop traffic (and are not meant to) as there is no physical fence.
I question if these should be declared as barriers.
The alternative would be to add the access=yes but that looks wrong to me.
To reproduce use this example - the route along the Balonne Highway.
https://map.project-osrm.org/?z=10&center=-27.957411%2C147.402191&loc=-27.965088%2C148.163815&loc=-27.993189%2C146.766357&hl=en&alt=0&srv=0

One suggested change to car can address this issue
git diff profiles/car.lua
index 95052d0ec..804087dc2 100644
--- a/profiles/car.lua
+++ b/profiles/car.lua
@@ -352,9 +352,14 @@ function process_node(profile, node, result, relations)
local flat_kerb = kerb and ("lowered" == kerb or "flush" == kerb)
local highway_crossing_kerb = barrier == "kerb" and highway and highway == "crossing"

•  -- make an exception for fence with sensory = audible
  

•  local sensory = node:get_value_by_key("sensory")
  

•  local fence_audible = "fence" == barrier and ("audible" == sensory or "audio" == sensory)
  

•  if not profile.barrier_whitelist[barrier]
             and not rising_bollard
             and not flat_kerb
  

•            and not fence_audible
             and not highway_crossing_kerb
             or restricted_by_height then
     result.barrier = true
  

@@ -385,7 +390,6 @@ function process_way(profile, way, result, relations)
bridge = way:get_value_by_key('bridge'),
route = way:get_value_by_key('route')
}

[tombay]

please excuse the silly format - add test in process_node() if it is a barrier

/software/Project-OSRM/osrm-backend$ diff profiles/car.lua profiles/car.lua.orig
355,358d354
< -- make an exception for fence with sensory = audible
< local sensory = node:get_value_by_key("sensory")
< local fence_audible = "fence" == barrier and ("audible" == sensory or "audio" == sensory)
<
362d357
< and not fence_audible
392a388

465a462