Fix a crash in the trip info panel. If you happen to open a trip of a

car waiting to spawn, its total path distance is briefly 0.

Also silence the lane-changing info for the moment, until work resumes
there.

game/src/info/trip.rs

@@ -143,7 +143,7 @@ pub fn ongoing(
         details,
         phases,
         &app.primary.map,
-        Some(props.dist_crossed / props.total_dist),
+        Some(props.dist_crossed.safe_percent(props.total_dist)),
     ));
     Widget::col(col)
 }

geom/src/distance.rs

@@ -102,6 +102,15 @@ impl Distance {
             }
         }
     }
+
+    /// Calculates a percentage, usually in [0.0, 1.0], of self / other. If the denominator is
+    /// zero, returns 0%.
+    pub fn safe_percent(self, other: Distance) -> f64 {
+        if other == Distance::ZERO {
+            return 0.0;
+        }
+        self / other
+    }
 }
 
 impl fmt::Display for Distance {

sim/src/mechanics/driving.rs

@@ -1123,12 +1123,14 @@ impl DrivingSimState {
             )
         {
             // TODO Can downgrade this to an alert or debug once active work has settled down
-            info!(
-                "{} is starting to change lanes from {} to {}",
-                car.vehicle.id,
-                car.router.head(),
-                target_lane
-            );
+            if false {
+                info!(
+                    "{} is starting to change lanes from {} to {}",
+                    car.vehicle.id,
+                    car.router.head(),
+                    target_lane
+                );
+            }
 
             // Exit the old queue (leaving a dynamic blockage in place)
             self.queues