<P> Officials also call for media time - outs, which allow time for television and radio advertising . They also stop the clock after a change of possession of the ball from one team to the other . Successful PATs (Point (s) After Touchdown), a field goal try, or a kickoff may also warrant stopping the clock . If an instant replay challenge is called during the game, the referees signal for a media time out . The referee signals these media time - outs by first using the time out signal, then extending both arms in a horizontal position . </P> <P> Separating the first and second halves is halftime . Teams change ends of the field at the end of the first quarter and the end of the third quarter . In the NFL, an automatic timeout is called by the officials when there are two minutes left in both the second and the fourth quarters, and overtime; this is most commonly referred to as the two - minute warning . No such warning is normally given in amateur football, though if there is no visible stadium clock, the referee will give a two - minute warning (four minutes in high school). </P> <P> If a game is tied at the end of four quarters, overtime is played . In overtime, the coin is tossed to determine which team will possess the ball first . The winner of the coin toss can choose to give the ball or receive the ball . If the first possession results in a field goal, the other team is given possession to match or better the field goal; therefore continuing the game . If the first possession results in a touchdown, the scoring team wins . During the regular season in the NFL, one overtime period is played (with each team receiving two time outs). If both teams are tied after the 10 - minute overtime, the game officially ends in a tie . In the playoffs, 15 - minute overtime periods continue until a winner is determined . Overtime follows after a three - minute intermission following the end of the regulation game . Prior to start of overtime, a coin flip is performed where the captain of the visiting team calls the toss . The team that wins the coin flip has the option to either receive the kickoff or choose the side of the field they wish to defend . Ties are rare in the NFL; a game between the Washington Redskins and Cincinnati Bengals in London on October 30, 2016, ended in a 27--27 tie . There had been a tie in a game the previous week; prior to that, the last tie was on October 12, 2014 . </P> <P> Super Bowl LI was the first Super Bowl to go into overtime with a 28 - 28 tie between the Atlanta Falcons and New England Patriots, which the Patriots eventually won by scoring a touchdown on their first drive . </P>

When does a football game go into overtime
find me the text answering this question