Allow Vehicle Motion to save properly

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

@@ -822,6 +822,9 @@ 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;
+        //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;
             }
@@ -833,6 +836,8 @@ public abstract class Entity {
             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;