diff --git a/crates/oa-core/src/routing.rs b/crates/oa-core/src/routing.rs
index 59b0ac0f..334495cc 100644
--- a/crates/oa-core/src/routing.rs
+++ b/crates/oa-core/src/routing.rs
@@ -1012,7 +1012,8 @@ fn crossing_cost(a: Position, b: Position, previous: &[Segment]) -> f32 {
                     )
                 };
                 if same {
-                    ((hi - lo).max(0.0) * 0.12).min(80.0)
+                    // Isolated P experiment; not an accepted production default.
+                    ((hi - lo).max(0.0) * 3.0).min(80.0)
                 } else {
                     0.0
                 }