// total should not exceed 225
CONST_INT TOTAL_NUMBER_OF_TRAFFIC_CARS					150
CONST_INT TOTAL_NUMBER_OF_PARKED_CARS					50	
CONST_INT TOTAL_NUMBER_OF_SET_PIECE_CARS				25	

// total should not exceed 12
CONST_INT MAX_NUMBER_OF_TRAFFIC_CARS_PLAYING_BACK 		8   
CONST_INT MAX_NUMBER_OF_SET_PIECE_CARS_PLAYING_BACK		4					

// this should be fine
CONST_INT MAX_NUMBER_OF_PARKED_CARS_PLAYING_BACK		6