When the timer sounds a warning horn, is it correct for the timer to signal 15 seconds before the 20-second replacement period ends?

The timer signaling a warning horn 15 seconds before the 20-second replacement period ends is appropriate within the rules of basketball. This practice is designed to ensure that teams are aware of the time remaining for replacements, allowing them to make necessary substitutions without rushing. This notification is essential for maintaining the pace of the game and providing teams with a fair opportunity to strategize and adjust their lineups.

By having a warning horn, the timer supports the proper management of game time and player rotations, which are critical aspects of basketball officiating. The rule serves to enhance the flow of the game, keeping it fair and orderly. Therefore, it is indeed correct for the timer to signal as described in the question, facilitating a smoother transition during player substitutions.