Which color is used for the rear vehicle flag?

• A. Blue
• B. Yellow
• C. Red
• D. Green

Answer: (D)

In signaling systems like this, colors quickly convey status to everyone involved. The flag on the rear vehicle marks the end of the group, so it needs a color that clearly communicates a steady, safe signal that everyone can recognize at a glance. Green is used here because it’s commonly understood as “go” or “safe,” and in the convoy/formation context it signals that this vehicle is the last one in line. That helps others know not to expect anyone behind this vehicle and to maintain the correct spacing.

Red would imply danger or stop, yellow signals caution, and blue isn’t the standard choice for marking the rear in this setup. So green best communicates the intended rear-flag status.