// calculate movement
      
        carLeftEdge += changeInCarPos;
	    if (carLeftEdge < 0)
		    carLeftEdge = 0;
	    else if (carLeftEdge > (PLAYERAWIDTH - BLOCKSIZE))
			carLeftEdge = PLAYAREAWIDTH - BLOCKSIZE;
		  
		randomDiceThrow = Math.random();
		if (roadDiceThrow < ROADGOESLEFT) changeInCarPos = -ANIMDELTA;
		else if (randomDiceThrow >= ROADGOESRIGHT) changeInCarPos = ANIMDELTA;
		else changeInCarPos
		
		changedLeftRoadEdge += changeInRoadPos;
		if (changedLeftRoadEdge < 0)
			changedLeftRoadEdge = 0;
		else if (changedLeftRoadEdge > PLAYAREAWIDTH - ROADWIDTH)
			changedLeftRoadEdge = PLAYAREAWIDTH - ROADWIDTH;
		
		for (roadPiece = NUMROADPIECES - 1; r)