What color are the LOBs without audio for guard and secondary?

• A. Guard/Primary = Pink, Secondary = Light blue
• B. Guard/Primary = Red, Secondary = Blue
• C. Guard/Primary = Green, Secondary = Yellow
• D. Guard/Primary = Purple, Secondary = Orange

Answer: (A)

When you’re operating without audio cues, you rely on visual signals to distinguish between different LOB streams. Colors are used to make each stream immediately identifiable, so you don’t have to interpret symbols or listen for a signal.

The guard/primary line is pink, and the secondary line is light blue. This pairing works well because pink grabs attention and clearly marks the primary guard channel, while light blue provides a distinct, contrasting color for the secondary channel without overwhelming the primary cue. Together, they minimize mix-ups when there’s no audio.

Other color pairings would either blend too closely or carry different implied meanings, making it harder to tell which stream is which at a glance.