INT 1 · M 10–13
Traffic separation scheme (TSS)
Areas & limitsCore
Magenta lane arrows and a separation line or zone organize shipping traffic.
What it means
Outlined arrows show established traffic direction; the central band or line separates opposing lanes.
Why it matters
COLREG Rule 10 applies. Small craft crossing a lane should do so on a heading as nearly as practicable at right angles and must not impede lane traffic.