Ensure u-turn exists in intersection view (#6376)

Due to some rather complex logic that tries to calculate intersection angles by looking further up the road, it's possible to return an intersection view that is missing a u-turn - something which is assumed to exist in later guidance calculations. We apply a fix here by ensuring the u-turn is always included in the returned view.
2022-09-27 13:49:12 +01:00
parent 660cea8fcc
commit ef8f3d7508
3 changed files with 54 additions and 4 deletions
@@ -0,0 +1,31 @@
+@routing @foot
+Feature: Foot - Intersections
+
+    Background:
+        Given the profile "foot"
+        Given a grid size of 2 meters
+
+    # https://github.com/Project-OSRM/osrm-backend/issues/6218
+    Scenario: Foot - Handles non-planar intersections
+        Given the node map
+
+            """
+                f
+                |
+                a
+                |
+            b---c---d
+                |
+                e
+            """
+
+        And the ways
+            | nodes | highway | foot | layer |
+            | ac    | footway | yes  | 0     |
+            | bc    | footway | yes  | 0     |
+            | cd    | footway | yes  | 0     |
+            | cef   | footway | yes  | 1     |
+
+        When I route I should get
+            | from | to | route    |
+            | a    | d  | ac,cd,cd |