3-1-1 Diagram

3-1-1 Immediately after the halftime intermission expires (PlayPic A), the referee must signal the timer (PlayPic B) to put 3 minutes on the clock (PlayPic C) and to immediately start the clock for the mandatory warm-up period. The head coach is responsible for his team being on the field for the mandatory warm-up at the end of the intermission.

3-1-1 The normal 15-minute period between halves may be extended by state association approval to a maximum of 20 minutes upon proper notification at least five minutes prior to scheduled kickoff. By mutual agreement of the coaches, the halftime intermission may be reduced to a minimum of 10 minutes.