Allow Vehicle Motion to save properly

src/main/java/net/minecraft/server/Entity.java

@@ -822,17 +822,22 @@ public abstract class Entity {
         this.motX = ((NBTTagDouble) nbttaglist1.a(0)).a;
         this.motY = ((NBTTagDouble) nbttaglist1.a(1)).a;
         this.motZ = ((NBTTagDouble) nbttaglist1.a(2)).a;
-        if (Math.abs(this.motX) > 10.0D) {
-            this.motX = 0.0D;
-        }
+        //CraftBukkit Start
+        //Exempt Vehicles from notch's sanity check
+        if (!(this.getBukkitEntity() instanceof CraftVehicle)) {
+            if (Math.abs(this.motX) > 10.0D) {
+                this.motX = 0.0D;
+            }
 
-        if (Math.abs(this.motY) > 10.0D) {
-            this.motY = 0.0D;
-        }
+            if (Math.abs(this.motY) > 10.0D) {
+                this.motY = 0.0D;
+            }
 
-        if (Math.abs(this.motZ) > 10.0D) {
-            this.motZ = 0.0D;
+            if (Math.abs(this.motZ) > 10.0D) {
+                this.motZ = 0.0D;
+            }
         }
+        //CraftBukkit End
 
         this.lastX = this.bi = this.locX = ((NBTTagDouble) nbttaglist.a(0)).a;
         this.lastY = this.bj = this.locY = ((NBTTagDouble) nbttaglist.a(1)).a;