The Rules of Flat Track Roller Derby

2.8 - Clocks

2.8.1 - Each game will have separate penalty clocks, jam clocks, and period clocks.

2.8.2.1 - The official period clock starts on the jam-starting whistle of the first jam.

2.8.2.2 - The official period clock does not stop between jams unless a timeout is called. The period clock stops during a timeout.

2.8.2.3 - Officials must stop the official period clock between jams when time exceeds 30 seconds.

2.8.2.4 - The official period clock must be highly visible to referees, teams, and fans.

2.8.3.1 - The official jam clock starts on the jam-starting whistle.

2.8.3.2 - The official jam clock stops at the end of each jam (on the fourth whistle).

2.8.3.3 - The official jam clock must be highly visible to referees, teams, and fans.

2.8.4.1 - Each game must have enough time clocks to time all penalties simultaneously (see Section 7.2.4 for details on penalty timing procedures).

2.8.4.2 - All penalty clocks stop between jams (see Section 7.2.4 for procedure).

2.8.4.3 - Penalty clocks are not required to be visible to referees, teams, and fans. While in the Penalty Box, skaters may request knowledge of how much penalty time they have remaining.