Rule 411

Signal aspect: Clear to Stop

Indication: Proceed, preparing to stop at next signal.

1. A high mast, single aspect signal displaying yellow.
2. A high mast, staggered, double aspect signal displaying yellow on the top, red on the bottom.
3. A high mast, inline, double aspect signal displaying yellow on the top, red on the bottom.
4. A high mast, inline, triple aspect signal displaying yellow on the top, red on the middle, red on the bottom.