Right now ShuttleControllers add the collision component to the Grid Entity.

Adds Grids to the collision group.

Content.Server/GameObjects/Components/Movement/ShuttleControllerComponent.cs

@@ -6,6 +6,7 @@ using Robust.Server.Interfaces.GameObjects;
 using Robust.Server.Interfaces.Player;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Interfaces.GameObjects.Components;
 using Robust.Shared.Interfaces.Map;
 using Robust.Shared.Interfaces.Network;
 using Robust.Shared.Interfaces.Timing;
@@ -53,6 +54,14 @@ namespace Content.Server.GameObjects.Components.Movement
                     physComp.Mass = 1;
                 }
 
+                if (!gridEntity.HasComponent<ICollidableComponent>())
+                {
+                    var collideComp = gridEntity.AddComponent<CollidableComponent>();
+                    collideComp.CollisionEnabled = true;
+                    collideComp.IsHardCollidable = true;
+                    collideComp.PhysicsShapes.Add(new PhysShapeGrid(grid));
+                }
+
                 physComp.LinearVelocity = CalcNewVelocity(direction, enabled) * WalkMoveSpeed;
             }
         }

Content.Shared/Physics/CollisionGroup.cs

@@ -1,5 +1,6 @@
 using System;
 using JetBrains.Annotations;
+using Robust.Shared.Map;
 
 namespace Content.Shared.Physics
 {
@@ -17,6 +18,8 @@ namespace Content.Shared.Physics
 		SmallImpassable = 1 <<  4, // 16 Things a smaller object - a cat, a crab - can't go through - a wall, but not a computer terminal or a table
         Clickable       = 1 <<  5, // 32 Temporary "dummy" layer to ensure that objects can still be clicked even if they don't collide with anything (you can't interact with objects that have no layer, including items)
 
+        MapGrid         = MapGridHelpers.CollisionGroup, // Map grids, like shuttles. This is the actual grid itself, not the walls or other entities connected to the grid.
+
         // 32 possible groups
         MobMask = Impassable | MobImpassable | VaultImpassable | SmallImpassable,
         AllMask = -1,