/**** 
* Classes
****/ 
var Car = Container.expand(function () {
	var self = Container.call(this);
	var carGraphics = self.attachAsset('car', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.acceleration = 0;
});
var Dust = Container.expand(function () {
	var self = Container.call(this);
	var dustGraphics = self.attachAsset('dirt', {
		anchorX: 0.5,
		anchorY: 0.5
	});
});
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obstacleGraphics = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -5;
	self.update = function () {
		self.y -= self.speed;
	};
});
var Skidmark = Container.expand(function () {
	var self = Container.call(this);
	var skidmarkGraphics = self.attachAsset('dirt', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.alpha = 1;
	self.update = function () {
		self.alpha -= 0.01;
		if (self.alpha <= 0) {
			self.destroy();
		}
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2e2e2e
});

/**** 
* Game Code
****/ 
game.down = function (x, y, obj) {
	game.isDown = true;
	var midScreenX = 2048 / 2;
	var distanceFromMid = x - midScreenX;
	if (distanceFromMid < 0) {
		car.rotation -= 0.1; // Rotate left
	} else {
		car.rotation += 0.1; // Rotate right
	}
};
game.up = function (x, y) {
	game.isDown = false;
};
var obstacles = [];
game.update = function () {
	if (game.isDown) {
		car.acceleration += 0.2;
		if (car.rotation != 0) {
			var skidmark = game.addChildAt(new Skidmark(), 0);
			skidmark.x = car.x;
			skidmark.y = car.y;
			if (skidmark.alpha <= 0) {
				skidmark.destroy();
			}
		}
	}
	car.x += Math.sin(car.rotation) * car.acceleration;
	car.y -= Math.cos(car.rotation) * car.acceleration;
	if (game.isDown) {
		car.acceleration *= 0.98; // Apply friction to slow down the car
	} else {
		car.acceleration *= 0.85; // Apply more friction when not accelerating
	}
	if (LK.ticks % 5 == 0) {
		// Every few ticks
		var dust = game.addChildAt(new Dust(), 0);
		dust.x = car.x;
		dust.y = car.y;
		dust.alpha = 0.1;
	}
	if (car.x < 0) {
		car.x = 0;
		car.acceleration = 0;
	}
	if (car.x > 2048) {
		car.x = 2048;
		car.acceleration = 0;
	}
	if (car.y < 0) {
		car.y = 0;
		car.acceleration = 0;
	}
	if (car.y > 2732) {
		car.y = 2732;
		car.acceleration = 0;
	}
};
var car = game.addChild(new Car());
car.x = 2048 / 2;
car.y = 2732 / 2 + 500;
for (var i = 0; i < 2048; i += 100) {
	for (var j = 0; j < 2732; j += 100) {
		if (Math.random() < 0.1) {
			var dust = game.addChildAt(new Dust(), 0);
			dust.x = i;
			dust.y = j;
		}
	}
}
var oldX, oldY;
game.move = function (x, y, obj) {
	if (!oldX) {
		oldX = x;
	}
	if (!oldY) {
		oldY = y;
	}
	if (game.isDown) {
		var dx = x - oldX;
		if (dx < 0) {
			dx = Math.max(dx, -4);
		}
		if (dx > 0) {
			dx = Math.min(dx, 4);
		}
		car.rotation += dx / 100; // Rotate left
		oldX = x;
		oldY = y;
	}
};

===================================================================
--- original.js
+++ change.js
@@ -68,13 +68,15 @@
 var obstacles = [];
 game.update = function () {
 	if (game.isDown) {
 		car.acceleration += 0.2;
-		var skidmark = game.addChildAt(new Skidmark(), 0);
-		skidmark.x = car.x;
-		skidmark.y = car.y;
-		if (skidmark.alpha <= 0) {
-			skidmark.destroy();
+		if (car.rotation != 0) {
+			var skidmark = game.addChildAt(new Skidmark(), 0);
+			skidmark.x = car.x;
+			skidmark.y = car.y;
+			if (skidmark.alpha <= 0) {
+				skidmark.destroy();
+			}
 		}
 	}
 	car.x += Math.sin(car.rotation) * car.acceleration;
 	car.y -= Math.cos(car.rotation) * car.acceleration;