feat(profiles): handle priority=forward/backward way tag in car profile

cmake/warnings.cmake

@@ -172,7 +172,7 @@ if(MSVC)
   message(STATUS "MSVC warning configuration applied - suppressed informational warnings, kept bug-indicating warnings")
 endif()
 
-if(APPLE)
+if (CMAKE_CXX_COMPILER_ID MATCHES "AppleClang" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   no_warning(unused-command-line-argument)
-  message(STATUS "Apple Clang detected - disabled unused-command-line-argument warning")
+  message(STATUS "Clang/AppleClang detected - disabled unused-command-line-argument warning")
 endif()

features/car/priority.feature

@@ -0,0 +1,30 @@
+@routing @priority @car
+Feature: Car - Priority tag handling
+The priority tag indicates traffic right-of-way direction on a way.
+priority=forward means forward traffic has right-of-way, penalizing backward.
+priority=backward means backward traffic has right-of-way, penalizing forward.
+
+    Background: Use specific speeds
+        Given the profile "car"
+        Given a grid size of 1000 meters
+
+    Scenario: Car - Priority tag applies directional penalty
+        Then routability should be
+            | highway     | maxspeed | priority | forw    | backw   | forw_rate | backw_rate |
+            | primary     | 60       |          | 48 km/h | 48 km/h | 13.3      | 13.3       |
+            | primary     | 60       | forward  | 48 km/h | 48 km/h | 13.3      | 9.3        |
+            | primary     | 60       | backward | 48 km/h | 48 km/h | 9.3       | 13.3       |
+
+    Scenario: Car - Priority penalty affects permitted direction on oneways
+        Then routability should be
+            | highway     | maxspeed | priority | oneway | forw    | backw   | forw_rate | backw_rate |
+            | primary     | 60       | forward  | yes    | 48 km/h |         | 13.3      |            |
+            | primary     | 60       | backward | yes    | 48 km/h |         | 9.3       |            |
+            | primary     | 60       | forward  | -1     |         | 48 km/h |           | 9.3        |
+            | primary     | 60       | backward | -1     |         | 48 km/h |           | 13.3       |
+
+    Scenario: Car - Directional penalty avoids bidirectional weight
+        Then routability should be
+            | highway     | maxspeed | priority | forw    | backw   | forw_rate | backw_rate |
+            | primary     | 60       | forward  | 48 km/h | 48 km/h | 13.3      | 9.3        |
+            | primary     | 60       | backward | 48 km/h | 48 km/h | 9.3       | 13.3       |

features/foot/way.feature

@@ -31,7 +31,7 @@ Feature: Foot - Accessability of different way types
             | cycleway       |      |
             | bridleway      |      |
 
-    Scenario: Foot - Basic access
+    Scenario: Foot - Leisure track handling
         Then routability should be
             | highway | leisure  | forw |
             | (nil)   | track    |      |

profiles/car.lua

@@ -42,6 +42,13 @@ function setup()
     -- Applied to bidirectional roads to prefer roads with clear lane markings
     lane_markings_penalty     = 0.75,
 
+    -- Penalty multiplier for the disadvantaged direction on ways tagged 'priority=forward'/'priority=backward'.
+    -- Applies to the per-direction rate (speed). A value < 1 reduces the disadvantaged
+    -- direction's rate which increases its routing weight (weight ≈ duration / rate).
+    -- This is applied to any way with a 'priority' tag; add an explicit width/lanes
+    -- guard if the penalty should only target narrow or single-lane roads.
+    priority_penalty          = 0.7,
+
     -- Size of the vehicle, to be limited by physical restriction of the way
     vehicle_height = 2.0, -- in meters, 2.0m is the height slightly above biggest SUVs
     vehicle_width = 1.9, -- in meters, ways with narrow tag are considered narrower than 2.2m

profiles/lib/way_handlers.lua

@@ -437,8 +437,22 @@ function WayHandlers.penalties(profile,way,result,data)
     sideroad_penalty = profile.side_road_multiplier
   end
 
-  local forward_penalty = math.min(service_penalty, width_penalty, alternating_penalty, sideroad_penalty)
-  local backward_penalty = math.min(service_penalty, width_penalty, alternating_penalty, sideroad_penalty)
+  local priority_forward_penalty = 1.0
+  local priority_backward_penalty = 1.0
+  if profile.priority_penalty then
+    -- priority_penalty scales the disadvantaged direction's per-direction rate (speed).
+    -- A value < 1 reduces that direction's rate, which increases its routing weight
+    -- because weight is computed as duration / rate.
+    local priority = way:get_value_by_key("priority")
+    if priority == "forward" then
+      priority_backward_penalty = profile.priority_penalty
+    elseif priority == "backward" then
+      priority_forward_penalty = profile.priority_penalty
+    end
+  end
+
+  local forward_penalty = math.min(service_penalty, width_penalty, alternating_penalty, sideroad_penalty, priority_forward_penalty)
+  local backward_penalty = math.min(service_penalty, width_penalty, alternating_penalty, sideroad_penalty, priority_backward_penalty)
 
   if profile.properties.weight_name == 'routability' then
     if result.forward_speed > 0 then
@@ -448,7 +462,12 @@ function WayHandlers.penalties(profile,way,result,data)
       result.backward_rate = (result.backward_speed * backward_penalty) / 3.6
     end
     if result.duration > 0 then
-      result.weight = result.duration / forward_penalty
+      -- Only set a bidirectional weight when penalties are equal.
+      -- When forward/backward penalties differ (directional penalty), avoid setting result.weight,
+      -- so the extractor uses per-direction rates (forward_rate/backward_rate) to compute weights.
+      if forward_penalty == backward_penalty then
+        result.weight = result.duration / forward_penalty
+      end
     end
   end
 end

taginfo.json

@@ -258,6 +258,8 @@
         {"key": "lanes:forward", "description": "Lanes in forward direction"},
         {"key": "lanes:backward", "description": "Lanes in backward direction"},
         {"key": "lane_markings", "value": "no", "description": "Penalty for roads without lane markings on bidirectional streets"},
+        {"key": "priority", "value": "forward", "object_types": ["way"], "description": "Traffic priority in forward direction; non-priority direction gets a penalty"},
+        {"key": "priority", "value": "backward", "object_types": ["way"], "description": "Traffic priority in backward direction; non-priority direction gets a penalty"},
         {"key": "surface", "value": "asphalt"},
         {"key": "surface", "value": "concrete"},
         {"key": "surface", "value": "concrete:plates"},