The traffic light safe word system uses red to mean stop immediately, yellow to mean slow down or check in, and green to mean continue or increase intensity. It gives participants a graduated way to communicate during a scene rather than forcing a binary choice between continuing and stopping.
The traffic light safe word system uses three colors to communicate different levels of need during a BDSM scene. Red means stop all activity immediately, and the scene ends or pauses for check-in and aftercare. Yellow means slow down, reduce intensity, or pause to check in without necessarily ending the scene. Green means continue, and some practitioners also use it to affirmatively request more intensity. The system is popular because it gives participants graduated options rather than forcing a binary choice between continuing and full stop. Many people find yellow particularly useful because it creates space to communicate discomfort or process something intense without feeling that they have failed or ruined the scene. The traffic light system is the default at most public dungeons and play parties, which means bystanders and dungeon monitors will recognize these signals even if they have not been briefed on the specific scene. For scenes involving gags or other speech restrictions, color signals can be translated into numbers of taps or squeezes.